Document:

Exhibit 10.1

 

Execution Version

 

SPONSOR SUPPORT AGREEMENT

 

This Sponsor Support Agreement
(this “Sponsor Agreement”) is dated as of March 30, 2021 by and among Qell Partners, LLC, a Cayman Islands limited
liability company (the “Sponsor”), Qell Acquisition Corp., a blank check company incorporated as a Cayman Islands exempted
company (“Qell”), Qell DutchCo B.V., a newly formed Dutch limited liability company that was formed by the Sponsor
for purposes of consummating the transactions contemplated by the Business Combination Agreement (as defined below), and which shall convert
into a Dutch public limited company (NV) prior to the Merger (as defined below) (“Holdco”), and Lilium GmbH, a German
limited liability company (the “Company”). Capitalized terms used but not defined herein shall have the respective
meanings ascribed to such terms in the Business Combination Agreement.

 

RECITALS 

 

WHEREAS, as of the date hereof
and in any event prior to the Merger and the Closing, the Sponsor has agreed to forfeit 1,828,945 Qell Class B Shares so that immediately
prior to the Merger Effective Time and the Closing (the “Forfeited Shares”), the Sponsor shall be the holder of record
and the “beneficial owner” (within the meaning of Rule 13d-3 under the Exchange Act) of 7,658,555 Qell Class B Shares and
7,060,000 Qell Warrants in the aggregate as set forth on Schedule I attached hereto;

 

WHEREAS, contemporaneously with
the execution and delivery of this Sponsor Agreement, Qell, Holdco, Queen Cayman Merger LLC, a Cayman exempted company and a direct wholly
owned subsidiary of Holdco (“Merger Sub”), and the Company, have entered into a business combination agreement (as
amended or modified from time to time, the “Business Combination Agreement”), dated as of the date hereof, pursuant
to which, among other transactions, Qell is to merge with and into Merger Sub, with Merger Sub continuing on as the surviving entity,
on the terms and conditions set forth therein (the “Merger”); and

 

WHEREAS, as a result of the
Company Share Exchange contemplated by the Business Combination Agreement, the Company will become a wholly-owned subsidiary of Holdco;

 

WHEREAS, as an inducement to
Qell and the Company to enter into the Business Combination Agreement and to consummate the transactions contemplated therein, the parties
hereto desire to agree to certain matters as set forth herein.

 

AGREEMENT

 

NOW, THEREFORE, in consideration
of the foregoing and the mutual agreements contained herein, and intending to be legally bound hereby, the parties hereto hereby agree
as follows:

 

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ARTICLE
I

SPONSOR SUPPORT AGREEMENT; COVENANTS

 

Section 1.1            Binding Effect of Business Combination Agreement. The Sponsor hereby acknowledges that it has read the Business Combination
Agreement and this Sponsor Agreement and has had the opportunity to consult with its tax and legal advisors. The Sponsor shall be bound
by and comply with Sections 5.9 (Transactions with Affiliates), 5.17 (Investigation; No Other Representation) and 6.4 (Public
Announcements) of the Business Combination Agreement (and any relevant definitions contained in any such Sections) as if the Sponsor
was an original signatory to the Business Combination Agreement with respect to such provisions.

 

Section 1.2           
No Transfer. During the period commencing on the date hereof and ending on the earlier of (a) the Merger Effective Time
and (b) such date and time as the Business Combination Agreement shall be terminated in accordance with Section 8.1 thereof, the Sponsor
shall not (i) sell, offer to sell, contract or agree to sell, assign, hypothecate, pledge, grant any option to purchase or otherwise dispose
of or agree to dispose of, directly or indirectly, file (or participate in the filing of) a registration statement with the SEC (other
than the Proxy Statement/Registration Statement) or establish or increase a put equivalent position or liquidate or decrease a call equivalent
position within the meaning of Section 16 of the Exchange Act, with respect to any Qell Shares or Qell Warrants owned by the Sponsor,
(ii) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership
of any shares of Qell Shares or Qell Warrants owned by the Sponsor (clauses (i) and (ii) collectively, a “Transfer”)
or (iii) publicly announce any intention to effect any transaction specified in clause (i) or (ii); provided, however, that
the foregoing shall not prohibit Transfers between the Sponsor and any Affiliate of the Sponsor, so long as, prior to and as a condition
to the effectiveness of any such Transfer, such Affiliate executes and delivers to Qell a joinder to this Sponsor Agreement in the form
attached hereto as Annex A.

 

Section 1.3             New Shares. In the event that (a) any Qell Shares, Qell Warrants or other Equity Securities of Qell are issued to the Sponsor
after the date of this Sponsor Agreement pursuant to any stock dividend, stock split, recapitalization, reclassification, combination,
conversion or exchange of Qell Shares or Qell Warrants of, on or affecting the Qell Shares or Qell Warrants owned by the Sponsor or otherwise,
(b) the Sponsor purchases or otherwise acquires beneficial ownership of any Qell Shares, Qell Warrants or other Equity Securities of Qell
after the date of this Sponsor Agreement, or (c) the Sponsor acquires the right to vote or share in the voting of any Qell Shares or other
Equity Securities of Qell after the date of this Sponsor Agreement (such Qell Shares, Qell Warrants or other Equity Securities of Qell,
collectively the “New Securities”), then such New Securities acquired or purchased by the Sponsor shall be subject
to the terms of this Sponsor Agreement to the same extent as if they constituted the Qell Shares or Qell Warrants owned by the Sponsor
as of the date hereof.

 

Section 1.4            
Closing Date Deliverables. On the Closing Commencement Date, the Sponsor shall deliver to Qell and the Company a duly executed
copy of that certain Registration Rights Agreement, by and among Qell, the Company, Holdco, the Sponsor and each Company Shareholder,
in substantially the form attached as Exhibit A to the Business Combination Agreement.

 

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Section 1.5            
Sponsor Support Agreements.

 

(a)         
The Sponsor hereby agrees to undertake actions to cause the convening of the Qell Shareholders Meeting in accordance with the Governing
Documents of Qell, for the purposes of obtaining the Qell Shareholder Approval and, if applicable, any approvals related thereto, including
the approval of the Business Combination Agreement and the transactions contemplated thereby, and an adjournment of the Qell of the Qell
Shareholders Meeting, if necessary, to permit further solicitation of proxies because there is not sufficient votes to approve and adopt
any of the foregoing. The Sponsor shall undertake any actions necessary to cause (so far as reasonably possible) the Closing to occur
and the completion of the transactions contemplated by the Business Combination Agreement, including the Holdco Reorganization, the Required
Holdco Shareholder Approval, the Merger, the Liquidation Distribution and Assumption, the Wiegand Board Appointment, the Remaining Holdco
Board Appointments, the Company Share Exchange, the post-Closing appointment of directors to the Holdco Board pursuant to Section 6.17
(Post-Closing Directors and Officers) of the Business Combination Agreement and any other action deemed as necessary or appropriate
in order to consummate the transactions contemplated by the Business Combination Agreement (it being acknowledged and agreed that Closing
and the transaction contemplated by the Business Combination Agreement are dependent on the performance of other parties and cannot be
successfully consummated by the actions of the Sponsor alone). For the avoidance of doubt, the Sponsor shall execute, or cause the execution
of, the Required Holdco Shareholder Approval as contemplated by the Business Combination Agreement.

 

(b)         
At any meeting of the shareholders of Qell, however called, or at any adjournment thereof, or in any other circumstance in which
the vote, consent or other approval of the shareholders of Qell is sought, the Sponsor shall (i) appear at each such meeting or otherwise
cause all of its Qell Shares to be counted as present thereat for purposes of calculating a quorum and (ii) vote (or cause to be voted),
or execute and deliver a written consent (or cause a written consent to be executed and delivered) covering, all of its Qell Shares:

 

(i)     
in favor of the Business Combination Proposal;

 

(ii)     
in favor of the Merger Proposal;

 

(iii)   
in favor of each Transaction Proposal;

 

(iv)    against any merger agreement, merger, consolidation, combination, sale of substantial assets, reorganization, recapitalization,
dissolution, liquidation or winding up of or by Qell (other than the Business Combination Agreement and the transactions contemplated
thereby);

 

(v)    
against any change in the business, management or Board of Directors of Qell (other than in connection with the Business Combination
Proposal, the Merger Proposal or the Transaction Proposals); and

 

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(vi)     
against any proposal, action or agreement that would (A) impede, frustrate, prevent or nullify any provision of this Sponsor Agreement,
the Business Combination Agreement or the transactions contemplated thereby, any Ancillary Document or any Merger, (B) result in a breach
in any respect of any covenant, representation, warranty or any other obligation or agreement of Qell, Holdco or Merger Sub under the
Business Combination Agreement or any Ancillary Document, (C) result in any of the conditions set forth in Article 7 of the Business
Combination Agreement not being fulfilled or (D) change in any manner the dividend policy or capitalization of, including the voting
rights of any class of capital stock of Qell.

 

The Sponsor hereby agrees
that it shall not commit or agree to take any action inconsistent with the foregoing.

 

(c)         
The Sponsor shall comply with, and fully perform all of its obligations, covenants and agreements set forth in, that certain letter
agreement, dated as of 29 September 2020, and amended and restated on 28 January 2021, by and among the Sponsor and Qell (the “Voting
Letter Agreement”), including without limitation the obligations of the Sponsor pursuant to Section 3 therein to not redeem
any Qell Shares owned by the Sponsor in connection with the transactions contemplated by the Business Combination Agreement.

 

(d)         
During the period commencing on the date hereof and ending on the earlier of the consummation of the Closing and the termination
of the Business Combination Agreement pursuant to Article 8 thereof, the Sponsor shall not modify or amend any Contract between or among
the Sponsor, anyone related by blood, marriage or adoption to the Sponsor or any Affiliate of the Sponsor (other than Qell or any of its
Subsidiaries), on the one hand, and Qell or any of Qell’s Subsidiaries, on the other hand, including, for the avoidance of doubt,
the Voting Letter Agreement.

 

Section 1.6           
Waiver of anti-dilution protection. Notwithstanding anything to the contrary in any other agreement or contract to which
the Sponsor is bound, the Sponsor (for itself and for its successors, heirs and assigns) hereby (but subject to the consummation of the
Merger) irrevocably and unconditionally waives, to the fullest extent permitted by law and Qell’s Governing Documents, and agrees
not to exercise, assert or perfect, any rights to adjustment or other anti-dilution protections with respect to the rate at which Qell
Class B Shares held by the Sponsor convert into Holdco Class A Shares, whether resulting from the transactions contemplated by the Business
Combination Agreement, the Subscription Agreements or otherwise, so that each Qell Class B Share held by the Sponsor issued and outstanding
as of immediately prior to the Merger shall convert into one Holdco Class A Share at the Merger Effective Time.

 

Section 1.7            Further Assurances. The Sponsor shall take, or cause to be taken, all actions and do, or cause to be done, all things reasonably
necessary under applicable Laws to consummate the Merger and the other transactions contemplated by the Business Combination Agreement
on the terms and subject to the conditions set forth therein and herein.

 

Section 1.8             No Inconsistent Agreement. The Sponsor hereby represents and covenants that the Sponsor has not entered into, and shall
not enter into, any agreement that would restrict, limit or interfere with the performance of the Sponsor’s obligations hereunder
or under the Business Combination Agreement or the transactions contemplated thereby.

 

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ARTICLE
II

REPRESENTATIONS AND WARRANTIES

 

Section 2.1            
Representations and Warranties of the Sponsor. The Sponsor represents and warrants as of the date hereof to Qell and the
Company as follows:

 

(a)         
Organization; Due Authorization. It is duly organized, validly existing and in good standing under the Laws of the jurisdiction
in which it is incorporated, formed, organized or constituted, and the execution, delivery and performance of this Sponsor Agreement and
the consummation of the transactions contemplated hereby are within the Sponsor’s corporate, limited liability company or organizational
powers and have been duly authorized by all necessary corporate, limited liability company or organizational actions on the part of the
Sponsor. This Sponsor Agreement has been duly executed and delivered by the Sponsor and, assuming due authorization, execution and delivery
by the other parties to this Sponsor Agreement, this Sponsor Agreement constitutes a legally valid and binding obligation of the Sponsor,
enforceable against the Sponsor in accordance with the terms hereof (except as enforceability may be limited by bankruptcy Laws, other
similar Laws affecting creditors’ rights and general principles of equity affecting the availability of specific performance and
other equitable remedies). If this Sponsor Agreement is being executed in a representative or fiduciary capacity, the Person signing this
Sponsor Agreement has full power and authority to enter into this Sponsor Agreement on behalf of the Sponsor.

 

(b)           
Ownership. The Sponsor is the record and beneficial owner (as defined in the Securities Act) of, and has good title to,
all of the Sponsor’s Qell Shares and Qell Warrants, and there exist no Liens or any other limitation or restriction (including any
restriction on the right to vote, sell or otherwise dispose of such Qell Shares or Qell Warrants (other than transfer restrictions under
the Securities Act)) affecting any such Qell Shares or Qell Warrants, other than Liens pursuant to (i) this Sponsor Agreement, (ii) the
Qell Governing Documents, (iii) the Business Combination Agreement, (iv) the Voting Letter Agreement or (v) any applicable securities
Laws. The Sponsor’s Qell Shares and Qell Warrants are the only Equity Securities in Qell owned of record or beneficially by the
Sponsor on the date of this Sponsor Agreement, and none of the Sponsor’s Qell Shares or Qell Warrants are subject to any proxy,
voting trust or other agreement or arrangement with respect to the voting of such Qell Shares or Qell Warrants, except as provided hereunder
and under the Voting Letter Agreement. Other than the Qell Warrants, the Sponsor does not hold or own any rights to acquire (directly
or indirectly) any equity securities of Qell or any equity securities convertible into, or which can be exchanged for, equity securities
of Qell.

 

(c)          
No Conflicts. The execution and delivery of this Sponsor Agreement by the Sponsor does not, and the performance by the
Sponsor of its obligations hereunder will not, (i) conflict with or result in a violation of the organizational documents of the Sponsor
or (ii) require any consent or approval that has not been given or other action that has not been taken by any Person (including under
any Contract binding upon the Sponsor or the Sponsor’s Qell Shares or Qell Warrants), in each case, to the extent such consent,
approval or other action would prevent, enjoin or materially delay the performance by the Sponsor of its, his or her obligations under
this Sponsor Agreement, the Business Combination Agreement or the transactions contemplated thereby.

 

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(d)          
Litigation. There are no Actions pending against the Sponsor, or to the knowledge of the Sponsor threatened against the
Sponsor, before (or, in the case of threatened Actions, that would be before) any arbitrator or any Governmental Authority, which in any
manner challenges or seeks to prevent, enjoin or materially delay the performance by the Sponsor of its, his or her obligations under
this Sponsor Agreement, the Business Combination Agreement or the transactions contemplated thereby.

 

(e)           
Brokerage Fees. Except as described on Section 5.4 of the Qell Disclosure Schedules, no broker, finder, investment banker
or other Person is entitled to any brokerage fee, finders’ fee or other commission in connection with the transactions contemplated
by the Business Combination Agreement based upon arrangements made by the Sponsor, for which Qell or any of its Affiliates may become
liable.

 

(f)           
Acknowledgment. The Sponsor understands and acknowledges that each of Qell and the Company is entering into the Business
Combination Agreement in reliance upon the Sponsor’s execution and delivery of this Sponsor Agreement.

 

(g)          
No Other Representations or Warranties. Except for the representations and warranties made by the Sponsor in this Article
II, neither the Sponsor nor any other Person makes any express or implied representation or warranty to Qell or the Company in connection
with this Sponsor Agreement or the transactions contemplated by this Sponsor Agreement, and the Sponsor expressly disclaims any such other
representations or warranties.

 

ARTICLE
III

EARNOUT

 

Section 3.1          
Sponsor Earnout Shares. The Sponsor agrees that, in connection with the Business Combination Agreement and the transactions
contemplated thereby, (i) the Forfeited Shares are hereby forfeited as of immediately prior to the Merger Effective Time, such shares
shall no longer be outstanding, and the Sponsor Shall have no further rights with respect to such shares and (ii) of the remaining Qell
Class B Shares held by the Sponsor immediately prior to the Merger Effective Time, forty (40%) of such Qell Class B Shares held by the
Sponsor immediately prior to the Merger Effective Time (being 3,063,422 Qell Class B Shares), plus any New Securities issued to
the Sponsor with respect to such Qell Class B Shares (including, for the avoidance of doubt, any Holdco Class A Shares issued to the Sponsor
as a result of the Merger, and any Equity Securities issued to the Sponsor after the date of this Sponsor Agreement pursuant to any stock
dividend, stock split, recapitalization, reclassification, combination, conversion or exchange of such Qell Class B Shares of, on or affecting
such Qell Class B Shares owned by the Sponsor) (the “Sponsor Earnout Shares”), shall, concurrently with the Closing,
or in the case of any New Securities (including any Holdco Class A Shares), concurrently with the issuance of such Equity Securities to
the Sponsor, have the Legend (as defined below) affixed to them and be held subject to the terms and conditions of this Article III.

 

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Section 3.2           
Legend. The books and records of Holdco evidencing the Sponsor Earnout Shares shall be stamped or otherwise imprinted with a legend
(the “Legend”) in substantially the following form:

 

THE SECURITIES EVIDENCED
HEREIN ARE SUBJECT TO RESTRICTIONS ON TRANSFER, AND CERTAIN OTHER AGREEMENTS, SET FORTH IN THE SPONSOR SUPPORT AGREEMENT, DATED AS OF
MARCH 30, 2021, BY AND AMONG ONE AND THE OTHER PARTIES THERETO.

 

Section 3.3            
Procedures Applicable to the Sponsor Earnout Shares.

 

(a)         
As soon as practicable, and in any event within five (5) Business Days after the occurrence of a Sponsor Earnout Triggering Event
(as defined below), Holdco shall remove, or cause to be removed, the Legend from the books and records of Holdco evidencing the Sponsor
Earnout Shares with respect to which a Sponsor Earnout Triggering Event has occurred, and such shares shall no longer be subject to any
of the terms of this Article III (any such removal of a Legend and other restrictions, a “Release”).

 

(b)          
In addition to and without limiting any restrictions on Transfers set forth in the Registration Rights Agreement, the Sponsor shall
not Transfer any Sponsor Earnout Shares until the date on which, in respect of such Sponsor Earnout Shares, the applicable Sponsor Earnout
Triggering Event has occurred as described in Section 3.4 below and the Legend on such shares has been removed from such shares
(other than in connection with Transfers to a Permitted Transferee (as such term is defined in the Investor Rights Agreement (as defined
in the Business Combination Agreement))).

 

Section 3.4           
Release of Sponsor Earnout Shares. The Sponsor Earnout Shares shall be Released as follows (each such event, a “Sponsor
Earnout Triggering Event”):

 

(a)         
thirty seven and a half percent (37.5%) of the Sponsor Earnout Shares will be Released (and the restrictions contained in this
Article III shall no longer apply to such shares other than such restrictions on Transfers set forth in the Registration Rights
Agreement) upon the earlier of (i) the first successful airborne flight (as determined by a majority of Holdco’s independent directors,
acting reasonably) of the Group’s seven (7)-seater aircraft (whether manned or unmanned), or (ii) March 31, 2024;

 

(b)         
thirty seven and a half percent (37.5%) of the Sponsor Earnout Shares will be Released (and the restrictions contained in this
Article III shall no longer apply to such shares other than such restrictions on Transfers set forth in the Registration Rights
Agreement) upon the earlier of (i) in respect of any aircraft developed by the Group, the receipt of “Type Certification”
as required (in accordance with applicable law) by the applicable Governmental Entities of either the European Union Aviation Safety Agency
or Federal Aviation Administration (including, for the avoidance of doubt, but not limited to, Type Certification based on the European
Union Aviation Safety Agency’s “SC VTOL” technical specifications), or (ii) June 30, 2025; and

 

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(c)         
twenty five percent (25%) of the Sponsor Earnout Shares will be Released (and the restrictions contained in this Article III
shall no longer apply to such shares other than such restrictions on Transfers set forth in the Registration Rights Agreement) upon
the earlier of (i) following the achievement of “Type Certification” of a Group Company aircraft in accordance with Section
3.5(b)(i), the Group Company incurring its first U.S. dollar ($) (or foreign equivalent) of positive revenue as recorded on its books
and records in the ordinary course related, connected and/or otherwise attributable to a “Type Certified” Group Company aircraft
(as determined by a majority of Holdco’s independent directors, acting reasonably), or (ii) September 30, 2025.

 

Section 3.5            
Release Upon Change of Control. If a Change of Control occurs, then immediately prior to and in connection with the consummation
of such Change of Control, Holdco shall Release or cause to be Released all of the Sponsor Earnout Shares that remain unvested. For the
purposes of this agreement, “Change of Control” shall mean, with respect to Holdco, the consummation of a sale, merger
or majority transfer of Equity Securities of Holdco, or the transfer of the majority of Holdco’s material assets (including, for
the avoidance of doubt, the transfer of subsidiary undertakings owned by Holdco and/or material assets and liabilities of Holdco and such
subsidiary undertakings).

 

Section 3.6            
Equitable Adjustments. The Sponsor Earnout Triggering Event targets set forth above, and the number of Sponsor Earnout Shares
Released in each event, as provided in this Article III, shall be equitably adjusted for stock splits, reverse stock splits, stock
dividends, reorganizations, recapitalizations, reclassifications, combination, exchange of shares or other like change or transaction
with respect to Holdco Shares occurring on or after the Closing.

 

Section 3.7            
Application of Article III. For the avoidance of doubt, nothing in this Article III shall be deemed to affect any
shares of Holdco Shares owned of record or beneficially by the Sponsor other than the Sponsor Earnout Shares, and all rights and obligations
of the Sponsor with respect to all shares of Holdco Shares owned by the Sponsor, other than the Sponsor Earnout Shares, will remain intact.

 

ARTICLE
IV

MISCELLANEOUS

 

Section 4.1            
Termination. This Sponsor Agreement and all of its provisions shall terminate and be of no further force or effect upon
the earlier of (a) the latest of the Release of all the Sponsor Earnout Shares, (b) the termination of the Business Combination Agreement
in accordance with its terms, (c) the liquidation of Qell and (d) the written agreement of the Sponsor, Qell, Holdco and the Company.
Upon such termination of this Sponsor Agreement, all obligations of the parties under this Sponsor Agreement will terminate, without any
liability or other obligation on the part of any party hereto to any Person in respect hereof or the transactions contemplated hereby,
and no party hereto shall have any claim against another (and no person shall have any rights against such party), whether under contract,
tort or otherwise, with respect to the subject matter hereof; provided, however, that the termination of this Sponsor Agreement shall
not relieve any party hereto from liability arising in respect of any breach of this Sponsor Agreement prior to such termination. This
Article IV shall survive the termination of this Sponsor Agreement.

 

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Section 4.2           
Governing Law; Venue. NOTWITHSTANDING THE PLACE WHERE THIS AGREEMENT MAY BE EXECUTED BY ANY OF THE PARTIES HERETO, THE
PARTIES EXPRESSLY AGREE THAT (1) THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED UNDER THE LAWS OF THE STATE OF NEW YORK AND (2) THE
VENUE FOR ANY ACTION TAKEN WITH RESPECT TO THIS AGREEMENT SHALL BE ANY STATE OR FEDERAL COURT IN NEW YORK COUNTY IN THE STATE OF NEW
YORK

 

Section 4.3            Waiver of Jury Trial. THE PARTIES EACH HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY RIGHT TO TRIAL BY JURY
OF ANY CLAIM, DEMAND, ACTION OR CAUSE OF ACTION (I) ARISING UNDER THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY, IN EACH CASE,
WHETHER NOW EXISTING OR HEREAFTER ARISING, AND WHETHER IN CONTRACT, TORT, EQUITY, OR OTHERWISE. THE PARTIES EACH HEREBY AGREES AND CONSENTS
THAT ANY SUCH CLAIM, DEMAND, ACTION OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL WITHOUT A JURY AND THAT THE PARTIES MAY FILE AN
ORIGINAL COUNTERPART OF A COPY OF THIS AGREEMENT WITH ANY COURT AS WRITTEN EVIDENCE OF THE CONSENT OF THE PARTIES HERETO TO THE WAIVER
OF THEIR RIGHT TO TRIAL BY JURY. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT (a) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY
HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER,
(b) EACH SUCH PARTY UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (c) EACH SUCH PARTY MAKES THIS WAIVER VOLUNTARILY
AND (d) EACH SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN
THIS SECTION 4.3.

 

Section 4.4            
Arbitration. Each of the Parties irrevocably and unconditionally agrees that any Proceeding based upon, arising out of
or related to this Agreement or any of the transactions contemplated hereby (each, a “Related Proceeding”) shall be
finally settled by binding arbitration in accordance with the Rules of Arbitration of the International Chamber of Commerce by three
arbitrators. Any Related Proceeding shall be decided by a panel of three (3) arbitrators seated in New York, New York. Each arbitrator
must be (a) an attorney with significant experience in negotiating complex commercial transactions, or a judge seated on, or retired
from, a U.S. federal court sitting in the Southern District of New York and (b) neutral and independent of each Party. The Parties agree,
pursuant to Article 30(2)(b) of the Rules of Arbitration of the International Chamber of Commerce, that the Expedited Procedure Rules
shall apply irrespective of the amount in dispute. The arbitrators may enter a default decision against any Party who fails to participate
in the arbitration proceedings with respect to any Related Proceeding. The language of the proceeding shall be English. The decision
of the arbitrators on the points in dispute will be final, unappealable and binding, and judgment on the award may be entered in any
court having jurisdiction thereof. The Parties and the arbitrators will keep confidential, and will not disclose to any Person, except
the Parties’ respective Representatives (who shall keep any such information confidential as provided in this sentence), or as
may be required by applicable Law or any Order of a Governmental Entity of competent jurisdiction, the existence of any Related Proceeding
under this Section 4.4, the referral of any such Related Proceeding to arbitration or the status or resolution thereof. The initiation
of any Related Proceeding pursuant to this Section 4.4 will toll the applicable statute of limitations for the duration of any
such Related Proceeding.

 

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Section 4.5           
Assignment. This Sponsor Agreement and all of the provisions hereof will be binding upon and inure to the benefit of the
parties hereto and their respective heirs, successors and permitted assigns. Neither this Sponsor Agreement nor any of the rights, interests
or obligations hereunder will be assigned (including by operation of law) without the prior written consent of all of the other parties
hereto.

 

Section 4.6           
Specific Performance. The parties hereto agree that irreparable damage may occur in the event that any of the provisions
of this Sponsor Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed
that the parties hereto shall be entitled to seek an injunction or injunctions to prevent breaches of this Sponsor Agreement and to enforce
specifically the terms and provisions of this Sponsor Agreement in the chancery court or any other state or federal court within the State
of New York, this being in addition to any other remedy to which such party is entitled at law or in equity.

 

Section 4.7          
Amendment. This Sponsor Agreement may not be amended, changed, supplemented, waived or otherwise modified or terminated,
except upon the execution and delivery of a written agreement executed by Qell, Holdco, the Company and the Sponsor.

 

Section 4.8           Severability.
If any provision of this Sponsor Agreement is held invalid or unenforceable by any court of competent jurisdiction, the other provisions
of this Sponsor Agreement will remain in full force and effect. Any provision of this Sponsor Agreement held invalid or unenforceable
only in part or degree will remain in full force and effect to the extent not held invalid or unenforceable.

 

Section 4.9           
Notices. All notices and other communications among the parties hereto shall be in writing and shall be deemed to have been
duly given (a) when delivered in person, (b) when delivered after posting in the United States mail having been sent registered or certified
mail return receipt requested, postage prepaid, (c) when delivered by FedEx or other nationally recognized overnight delivery service
or (d) when e-mailed during normal business hours (and otherwise as of the immediately following Business Day), addressed as follows:

 

If to Qell:

 

Qell Acquisition Corp.

 

505 Montgomery Street,
Suite 1100

San Francisco, CA 94111

Attention:      Barry Engle,

Sam Gabbita,

Email:           Sam.gabbita@qellpartners.com

Barry.engle@qellpartners.com,

 

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with a copy to (which will not constitute notice):

 

Goodwin Proctor LLP

 

100 Northern Avenue

Boston, MA 02210

Attention:      Jocelyn Arel

Joshua Klazkin

Email:           Jarel@goodwinlaw.com

Jklatzkin@goodwinlaw.com

 

If to Holdco:

 

Qell DutchCo B.V.

 

c/o Qell Acqusition Corp.

505 Montgomery Street, Suite 1100

San Francisco, CA 94111

Attention:      Barry Engle,

Sam Gabbita,

Email:           Sam.gabbita@qellpartners.com

Barry.engle@qellpartners.com,

 

with a copy to (which will not constitute notice):

 

Goodwin Proctor LLP

 

100 Northern Avenue

Boston, MA 02210

Attention:      Jocelyn Arel

Joshua Klazkin

Email:           Jarel@goodwinlaw.com

Jklatzkin@goodwinlaw.com

 

If to the Company:

 

Lilium GmbH

 

Claude-Dornier Straße 1, Geb. 335

82234 Wessling Germany

Attention:      Daniel Wiegand CEO

Email:           daniel.wiegand@lilium.com

 

    C-11 

     

    

 

with a copy to:

 

Ropes & Gray LLP

 

1211 Avenue of the Americas

New York, NY 02210

Attention:      Carl P. Marcellino

 Tara Fisher

Email:
           carl.marcellino@ropesgray.com

tara.fisher@ropesgray.com

 

with copies to each of (which shall not constitute notice):

 

Orrick, Herrington & Sutcliffe (UK) LLP

107 Cheapside

London EC2V 6DN

United Kingdom

Attention:      Christopher Grew

Christopher Rödter

Email:           cgrew@orrick.com

croedter@orrick.com

 

If to the Sponsor:

 

To the Sponsor’s address set forth in Schedule I

with a copy to (which will not constitute notice):

 

Goodwin Proctor LLP

 

100 Northern Avenue

Boston, MA 02210

Attention:      Jocelyn Arel

Joshua Klazkin

Email:           Jarel@goodwinlaw.com

Jklatzkin@goodwinlaw.com

 

Section 4.10         
Counterparts. This Sponsor Agreement may be executed in two or more counterparts (any of which may be delivered by electronic
transmission), each of which shall constitute an original, and all of which taken together shall constitute one and the same instrument.

 

Section 4.11        
Entire Agreement. This Sponsor Agreement and the agreements referenced herein constitute the entire agreement and understanding
of the parties hereto in respect of the subject matter hereof and supersede all prior understandings, agreements or representations by
or among the parties hereto to the extent they relate in any way to the subject matter hereof.

 

[THE REMAINDER OF THIS PAGE IS INTENTIONALLY
BLANK]

 

    C-12 

     

    

 

IN WITNESS WHEREOF, the Sponsor,
Qell, Holdco and the Company have each caused this Sponsor Agreement to be duly executed as of the date first written above.

 

	 	SPONSOR:

 

		QELL PARTNERS, LLC

 

		By:	/s/ Barry Engle
			Name: Barry Engle
			Title: CEO

 

[Signature Page to Sponsor Support Agreement]

 

     

     

    

 

	 	QELL:

 

		QELL acquisition CORP. 

 

		By:	/s/ Barry Engle
			Name: Barry Engle
			Title: CEO

 

[Signature Page to Sponsor Support Agreement]

 

     

     

    

 

	 	COMPANY:

 

		LILIUM GMBH

 

		By:	/s/ Daniel Wiegand
			Name: Daniel Wiegand
			Title: CEO

 

[Signature Page to Sponsor Support Agreement]

 

     

     

    

 

	 	HOLDCO:

 

		QELL DUTCHCO B.V.

 

		By:	/s/ Barry
                                            Engle
			Name: Barry Engle
			Title: CEO

 

[Signature Page to Sponsor Support Agreement]

 

     

     

    

 

Schedule I

Sponsor Qell Shares and Qell
Warrants

 

	Sponsor	 	Qell Class A

 Shares	 	 	Qell Class B

 Shares	 	 	Qell Warrants	 
	Qell Partners, LLC 	 	 	N/A	 	 	 	7,658,555	 	 	 	7,060,000	 
	c/o Qell Acquisition Corp.	 	 	 	 	 	 	 	 	 	 	 	 

 

[Schedule I to Sponsor Support Agreement]

 

     

     

    

 

Annex A

Form of Joinder Agreement 

 

This Joinder Agreement (this “Joinder
Agreement”) is made as of the date written below by the undersigned (the “Joining Party”) in accordance with
the Sponsor Support Agreement, dated as of [●], 2021 (as amended, supplemented or otherwise modified from time to time, the “Support
Agreement”), by and among Qell Acquisition Corp., a blank check company incorporated as a Cayman Islands exempted company, Qell
DutchCo B.V., a Dutch limited liability company, Lilium GmbH, a German limited liability company, and the Sponsor set forth on Schedule
I thereto. Capitalized terms used herein and not otherwise defined shall have the meaning ascribed to them in the Support Agreement.

 

The Joining Party hereby acknowledges, agrees
and confirms that, by its execution of this Joinder Agreement, the Joining Party shall be deemed to be a party to, and a “Sponsor”
under, the Support Agreement as of the date hereof and shall have all of the rights and obligations of a Sponsor as if it had executed
the Support Agreement. The Joining Party hereby ratifies, as of the date hereof, and agrees to be bound by, all of the terms, provisions
and conditions contained in the Support Agreement.

 

IN WITNESS WHEREOF, the undersigned has duly executed
this Joinder Agreement as of the date written below.

 

	 	 	 	 	 
	Date: [●], 2021	 	 	 	 
	 	 	 
	 	 	By:	 	 
	 	 	 	 	Name:
	 	 	 	 	Title:
	 	 
	 	 	Address for Notices:
	 	 
	 	 	With copies to:

 

[Annex A to Sponsor Support Agreement]Exhibit 10.2

 

SUBSCRIPTION AGREEMENT

 

This SUBSCRIPTION AGREEMENT
(this “Subscription Agreement”) is entered into on _________, 2021, by and between Qell Acquisition Corp, a Cayman
Islands exempted company (“Qell”),
Qell DutchCo B.V. (“Lilium Holdco”), and the undersigned subscriber (the “Investor”).

 

WHEREAS, this Subscription
Agreement is being entered into in connection with the proposed business combination (the “Transaction”) between Qell,
and Lilium GmbH (“Lilium”), pursuant to a business combination agreement to be entered into concurrently with this
Subscription Agreement among Lilium, Lilium Holdco and the other parties thereto (the “Transaction Agreement”);

 

WHEREAS, in connection with
the Transaction, Qell is seeking commitments from interested investors to purchase, upon closing of the Transaction, shares of Lilium
Holdco’s Class A ordinary shares, with a nominal value of €0.12 per share (the “Shares”),
in a private placement for a purchase price of $10.00 per share (the “Per Share Subscription Price”);

 

WHEREAS, the aggregate purchase
price to be paid by the Investor for the subscribed Shares (as set forth on the signature page hereto) is referred to herein as the “Subscription
Amount”; and

 

WHEREAS, substantially concurrently
with the execution of this Subscription Agreement, Qell and Lilium Holdco are entering into separate subscription agreements in respect
of subscription to the Shares (collectively, the “Other Subscription Agreements”) with certain investors (the “Other
Investors”) with an aggregate purchase price of $450,000,000 (inclusive of the Subscription Amount) (the “PIPE Investment”).

 

NOW, THEREFORE, in consideration
of the foregoing and the mutual representations, warranties and covenants, and subject to the conditions, set forth herein, and intending
to be legally bound hereby, each of the Investor, Qell and Lilium Holdco acknowledges and agrees as follows:

 

1.                 
Subscription. The Investor hereby irrevocably subscribes for and agrees to purchase from Lilium Holdco, and Lilium Holdco
agrees to issue and sell to the Investor the number of Shares set forth on the signature page of this Subscription Agreement on the terms
and subject to the conditions provided for herein. The Investor understands that the subscribed Shares that will be issued pursuant to
this Subscription Agreement will be Class A ordinary shares of Lilium Holdco, which will be a Netherlands public limited liability company
(naamloze vennootschap) at Closing (as defined below).

 

2.                  
Closing.

 

(a)                 [The
closing of the sale of the Shares contemplated hereby (the “Closing”)
shall occur on a closing date (the “Closing
Date”) specified in the Closing Notice (as defined below), and be conditioned upon the prior or substantially
concurrent consummation of the Transaction (the closing date of the Transaction, the “Transaction Closing Date”).
Upon delivery of written notice from (or on behalf of) Lilium Holdco to the Investor (the “Closing
Notice”), that Lilium Holdco reasonably expects all conditions to the closing of the Transaction to be satisfied or
waived on an expected Transaction Closing Date that is not less than five (5) business days from the date on which the Closing
Notice is delivered to the Investor, the Investor shall deliver the Subscription Amount three (3) business days prior to the
expected Closing Date by wire transfer of United States dollars in immediately available funds to the account(s) specified in the
Closing Notice (the “Transfer Date”), to be held by Lilium Holdco or in escrow until the Closing Date; provided
however, that an Investor may extend such Transfer Date upon prior written agreement between such Investor and Lilium Holdco. On the
Closing Date, Lilium Holdco shall issue the Shares to the Investor and subsequently cause the Shares to be registered in book entry
form in the name of the Investor on Lilium Holdco’s share register. Not later than one (1) business day after the Closing
Date, Lilium Holdco shall deliver to the Investor a copy of the records of Lilium Holdco’s transfer agent or other evidence
showing Investor as the owner of the Shares on and as of the Closing Date. For purposes of this Subscription Agreement, “business
day” shall mean a day, other than a Saturday, Sunday or other day on which commercial banks in New York, New York,
London, England, U.K., Hong Kong Special Administrative Region of the People’s Republic of China, or China are authorized or
required by law to close.

 

     

     

    

 

(b)                
In the event the Transaction Closing Date does not occur within two (2) business days after the Closing Date under this Subscription
Agreement, Lilium Holdco shall promptly (but not later than two (2) business days thereafter) arrange for the Subscription Amount to returned
to the Investor by wire transfer of U.S. dollars in immediately available funds to the account specified by the Investor, and any book-entries
for the Shares shall be deemed repurchased and cancelled; provided that, unless this Subscription Agreement has been terminated
pursuant to Section 10 hereof, such return of funds shall not terminate this Subscription Agreement or relieve the Investor of
its obligation to purchase the Shares at the Closing.

 

(c)                
Prior to or at the Closing, the Investor shall deliver to Lilium Holdco a duly completed and executed Internal Revenue Service
Form W-9 or appropriate Form W-8.]

 

In place of the above,
the below will be included for mutual funds:

 

[The closing of the sale
of the Shares contemplated hereby (the “Closing”)
shall occur on a closing date (the “Closing
Date”) specified in the Closing Notice (as defined below), which date shall be no more than two (2) business days immediately
prior to, and shall be conditioned upon the substantially concurrent consummation of the Transaction (the closing date of the Transaction,
the “Transaction Closing Date”). Upon delivery of written notice from (or on behalf of) Lilium Holdco to the Investor
(the “Closing Notice”),
that Lilium Holdco reasonably expects all conditions to the closing of the Transaction to be satisfied or waived on an expected Transaction
Closing Date that is not less than six (6) business days from the date on which the Closing Notice is delivered to the Investor, the Investor
shall deliver, subject to the conditions set forth in this Section 2 and Section 3, the Subscription Amount on the specified Closing
Date by wire transfer of United States dollars in immediately available funds to the account(s) specified in the Closing Notice. On the
Closing Date and prior to the release of its Subscription Amount by the Investor, Lilium Holdco shall issue the Shares free and clear
of any liens or other restrictions (other than those arising under applicable securities laws) against payment of the Subscription Amount
to the Investor and cause the Shares to be registered in book entry form in the name of the Investor on Lilium Holdco’s share register
and will provide to the Investor evidence of such issuance from Lilium Holdco’s transfer agent. For purposes of this Subscription
Agreement, “business day”
shall mean a day, other than a Saturday, Sunday or other day on which commercial banks in New York, New York, London, England, U.K., Hong
Kong Special Administrative Region of the People’s Republic of China, or China are authorized or required by law to close. Prior
to or at the Closing, Investor shall deliver to Lilium Holdco a duly completed and executed Internal Revenue Service Form W-9 or appropriate
Form W-8. In the event the Transaction Closing Date does not occur within two (2) business days after the Closing Date under this Subscription
Agreement, Lilium Holdco shall promptly (but not later than one (1) business day thereafter) arrange for the Subscription Amount to be
returned to the Investor by wire transfer of U.S. dollars in immediately available funds to the account specified by the Investor, and
any book-entries for the Shares shall be deemed repurchased and cancelled; provided that, unless this Subscription Agreement has
been terminated pursuant to Section 10 hereof, such return of funds shall not terminate this Subscription Agreement or relieve
the Investor of its obligation to purchase the Shares at the Closing, upon delivery of a new Closing Notice as set forth in this Section
2.]

 

3.                  
Closing Conditions.

 

(a)                
The obligation of the parties hereto to consummate the purchase and sale of the Shares pursuant to this Subscription Agreement
is subject to the following conditions: (i) no applicable governmental authority shall have enacted, issued, promulgated, enforced or
entered any judgment, order, law, rule, injunction or regulation (whether temporary, preliminary or permanent) which is then in effect
and has the effect of making consummation of the transactions contemplated hereby illegal or otherwise restraining or prohibiting consummation
of the issuance and sale of the Shares under this Subscription Agreement; (ii) all conditions precedent to the closing of the Transaction
set forth in the Transaction Agreement shall have been satisfied or waived (other than those conditions which, by their nature, are to
be satisfied at the closing of the Transaction pursuant to the Transaction Agreement), and the closing of the Transaction shall be scheduled
to occur substantially concurrently with the Closing; and (iii) no amendment, modification or waiver of the Transaction Agreement shall
have occurred that would reasonably be expected to materially and adversely impact the economic benefits that the Investor would reasonably
expect to receive under this Subscription Agreement without having received the Investor’s prior written consent.

 

    2

     

    

 

(b)               
 The obligation of the Investor to consummate the purchase and sale of the Shares pursuant to this Subscription Agreement is subject
to the additional following conditions: (i) all representations and warranties of each of Lilium Holdco and Qell contained in this Subscription
Agreement shall be true and correct in all material respects when made (other than representations and warranties that are qualified as
to materiality, Material Adverse Effect (as defined below) or Qell Material Adverse Effect (as defined below), which representations and
warranties shall be true and correct in all respects) and shall be true and correct in all material respects on and as of the Closing
Date (unless they specifically speak as of another date in which case they shall be true and correct in all material respects as of such
date) (other than representations and warranties that are qualified as to materiality, Material Adverse Effect or Qell Material Adverse
Effect, which representations and warranties shall be true and correct in all respects); (ii) Lilium Holdco shall have performed, satisfied
and complied in all material respects with the covenants, agreements and conditions required by this Subscription Agreement to be performed,
satisfied or complied with by it at or prior to the Closing; (iii) no suspension of the qualification of the Shares for offering or sale
in any jurisdiction shall have occurred, and the Shares acquired hereunder shall have been approved for listing on the Nasdaq (as defined
below), subject to official notice of issuance; and (iv) there shall have been no amendment, waiver or modification to any Other Subscription
Agreements that materially benefits such Other Investor thereunder unless the Investor has been offered the same benefits.

 

4.                 
Further Assurances. At the Closing, the parties hereto shall execute and deliver such additional documents and take such
additional actions as the parties reasonably may deem to be practical and necessary to consummate the subscription as contemplated by
this Subscription Agreement.

 

5.                  
Lilium Holdco Representations and Warranties. Lilium Holdco represents and warrants to the Investor, as of the date hereof
and as of the Closing Date, that:

 

(a)                 
Lilium Holdco has been duly incorporated and is validly existing as a private limited company under the laws of the Netherlands
(and will be converted to a Dutch public limited liability company (naamloze vennootschap) prior to Closing), with corporate power
to own, lease and operate its properties and conduct its business and to enter into, deliver and perform its obligations under this Subscription
Agreement.

 

(b)                
As of the Closing Date, the Shares will be duly authorized and, when issued and delivered to the Investor against full payment
therefor in accordance with the terms of this Subscription Agreement, the Shares will be validly issued, fully paid and non-assessable
and will not have been issued in violation of or subject to any preemptive rights, encumbrances or similar rights created under Lilium
Holdco’s articles of association (as in effect at such time of issuance) or under the laws of the Netherlands.

 

(c)                  This
Subscription Agreement has been duly authorized, executed and delivered by Lilium Holdco and, assuming that this Subscription Agreement
constitutes the valid and binding agreement of the Investor, this Subscription Agreement is enforceable against Lilium Holdco in accordance
with its terms, except as may be limited or otherwise affected by (i) bankruptcy, insolvency, fraudulent conveyance, reorganization,
moratorium or other laws relating to or affecting the rights of creditors generally, or (ii) principles of equity, whether considered
at law or equity.

 

(d)                  The
execution, delivery and performance of this Subscription Agreement, including the issuance and sale of the Shares hereunder, will not
conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, or result in the
creation or imposition of any lien, charge or encumbrance upon any of the property or assets of Lilium Holdco or any of its subsidiaries
pursuant to the terms of (i) any indenture, mortgage, deed of trust, loan agreement, lease, license or other agreement or instrument
to which Lilium Holdco or any of its subsidiaries is a party or by which Lilium Holdco or any of its subsidiaries is bound or to which
any of the property or assets of Lilium Holdco is subject that would reasonably be expected to have a material adverse effect on the
business, financial condition or results of operations of Lilium Holdco and its subsidiaries, taken as a whole (a “Material
Adverse Effect”), or materially affect the validity of the Shares or the legal authority of Lilium Holdco to comply
in all material respects with its obligations under this Subscription Agreement; (ii) result in any violation of the provisions
of the organizational documents of Lilium Holdco; or (iii) result in any violation of any statute or any judgment, order, rule or
regulation of any court or governmental agency or body, domestic or foreign, having jurisdiction over Lilium Holdco or any of its properties
that would reasonably be expected to have a Material Adverse Effect or materially affect the validity of the Shares or the legal authority
of Lilium Holdco to comply in all material respects with its obligations under this Subscription Agreement.

 

    3

     

    

 

(e)               
Assuming the accuracy of the Investor’s representations and warranties set forth in Section 8 of this Subscription
Agreement, no registration under the Securities Act of 1933, as amended (the “Securities Act”), is required for the
offer and sale of the Shares to the Investor.

 

(f)                
Neither Lilium Holdco nor any person acting on its behalf has offered or sold the Shares by any form of general solicitation or
general advertising in violation of the Securities Act.

 

(g)               
Lilium Holdco is not under any obligation to pay any broker’s fee or commission in connection with the sale of the Shares
other than to the Placement Agents (as defined below).

 

(h)               
Neither Lilium Holdco nor Qell has entered into any subscription agreement, side letter or similar agreement with any Other Investor
or any other investor in connection with such Other Investor’s or other investor’s direct or indirect investment in Lilium
Holdco or Qell other than the Transaction Agreement, the Other Subscription Agreements and agreements with strategic investors that are
currently in place with Lilium. The Other Subscription Agreements reflect the same Per Share Subscription Price and other terms with respect
to the purchase of the Shares that are no more favorable to such subscriber thereunder than the terms of this Subscription Agreement,
other than terms particular to the regulatory requirements of such subscriber or its affiliates or related funds that are mutual funds
or are otherwise subject to regulations related to the timing of funding and the issuance of the related Shares. The Other Subscription
Agreements have not been amended in any material respect following the date of this Subscription Agreement.

 

(i)                 
As of the date of this Subscription Agreement, the issued share capital of Lilium Holdco consists of 450,000 ordinary shares with
a nominal value of EUR 0.10 each, and such share is duly authorized and validly issued, and is not subject to preemptive rights or encumbrances.
As of the date of this Subscription Agreement, and immediately prior to Closing, except as set forth above and pursuant to the Other Subscription
Agreements, the Transaction Agreement and the transactions contemplated thereby, there are no outstanding (i) shares, equity interests
or voting securities of Lilium Holdco, (ii) securities of Lilium Holdco convertible into or exchangeable for shares or other equity interests
or voting securities of Lilium Holdco, or (iii) options, warrants or other rights (including preemptive rights) or agreements, arrangements
or commitments of any character, whether or not contingent, of Lilium Holdco to acquire from any individual, entity or other person, and
no obligation of Lilium Holdco to issue, any shares or other equity interests or voting securities of Lilium Holdco (collectively, the
 “Equity Interests”) or securities convertible into or exchangeable or exercisable for Equity Interests. As of the date
of this Subscription Agreement, there are no shareholder agreements, voting trusts or other agreements or understandings to which Lilium
Holdco is a party or by which it is bound relating to the voting of any securities of Lilium Holdco, other than as contemplated by the
Transaction Agreement and the transactions contemplated thereby. There are no securities or instruments issued by or to which Lilium Holdco
is party containing anti-dilution or similar provisions that will be triggered by the issuance of the Shares hereunder or under any Other
Subscription Agreement, in each case, that have not been or will not be validly waived on or prior to the Closing Date.

 

(j)                 
Lilium Holdco is in compliance with all applicable laws, except where such non-compliance would not reasonably be expected to have,
individually or in the aggregate, a Material Adverse Effect. As of the date hereof, Lilium Holdco has not received any written communication
from a governmental authority that alleges that Lilium Holdco is not in compliance with or is in default or violation of any applicable
law, except where such non-compliance, default or violation would not reasonably be expected to have, individually or in the aggregate,
a Material Adverse Effect.

 

(k)                
Except for such matters as have not had and would not be reasonably likely to have, individually or in the aggregate, a Material
Adverse Effect, there is no (i) action, suit, claim or other proceeding, in each case by or before any governmental authority pending,
or, to the knowledge of Lilium Holdco, threatened against Lilium Holdco, or (ii) judgment, decree, injunction, ruling or order of any
governmental entity or arbitrator outstanding against Lilium Holdco.

 

    4

     

    

 

(l)                 
 Lilium Holdco is not required to obtain any material consent, waiver, authorization or order of, give any notice to, or make any
filing or registration with, any Dutch court or other governmental authority, self-regulatory organization or other person in connection
with the issuance of the Shares pursuant to this Subscription Agreement, other than (i) filings with the Securities and Exchange Commission
(the “SEC”), (ii) filings required by applicable state or federal securities laws, (iii) the filings required in accordance
with Section 14 of this Subscription Agreement; (iv) those required by the Nasdaq Stock Market LLC (“Nasdaq”),
(v) those required to consummate the Transaction as provided under the Transaction Agreement, and (vi) those the failure of which to obtain
would not be reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect.

 

(m)               
Upon consummation of the Transaction, it is intended that the Shares will be registered pursuant to Section 12(b) of the Securities
Exchange Act of 1934, as amended (the “Exchange Act”) and will be listed for trading on the Nasdaq, and the
Shares will be approved for listing on Nasdaq, subject to official notice of issuance.

 

(n)               
A copy of each form, report, statement, schedule, prospectus, proxy, registration statement and other document, if any, filed by
Lilium Holdco on or prior to the Closing Date (the “SEC Documents”) is available to the undersigned via the SEC’s
EDGAR system. As of their respective dates, all reports required to be filed by Lilium Holdco with
the SEC complied in all material respects with the applicable requirements of the Securities Act and/or the Exchange Act, and the rules
and regulations of the SEC promulgated thereunder. None of the SEC Documents contained, when filed or, if amended, as of the date
of such amendment with respect to those disclosures that are amended, any untrue statement of a material fact or omitted to state a material
fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were
made, not misleading; provided, that with respect to the information about Lilium Holdco’s affiliates contained in any SEC Document
to be filed by Lilium Holdco the representation and warranty in this sentence is made to Lilium Holdco’s knowledge after reasonable
investigation. The financial statements of Lilium Holdco included in the SEC Documents comply in
all material respects with applicable accounting requirements and the rules and regulations of the SEC with respect thereto as in effect
at the time of filing and fairly present in all material respects the financial position of Lilium Holdco as of and for the dates thereof
and the results of operations and cash flows for the periods then ended, subject, in the case of unaudited statements, to normal, year-end audit
adjustments. Lilium Holdco has timely filed each report, statement, schedule, prospectus, and registration statement that Lilium Holdco
was required to file with the SEC since its inception. There are no material outstanding or unresolved comments in comment letters
from the staff of the Division of Corporation Finance of the SEC with respect to any of the SEC Documents.

 

(o)                
Lilium Holdco is not in default or violation (and no event has occurred which, with notice or the lapse of time or both, would
constitute a default or violation) of any term, condition or provision of (i) the organizational documents of Lilium Holdco, (ii) any
loan or credit agreement, note, bond, mortgage, indenture, lease or other agreement, permit, franchise or license to which Lilium Holdco
is now a party or by which Lilium Holdco’s properties or assets are bound or (iii) any statute or any judgment, order, rule or regulation
of any court or governmental agency or body, domestic or foreign, having jurisdiction over Lilium Holdco or any of its properties, except,
in the case of clauses (ii) and (iii), for defaults or violations that have not had and would not reasonably be expected to have, individually
or in the aggregate, a Material Adverse Effect.

 

6.                  
Lilium Holdco acknowledges and agrees that, notwithstanding anything herein to the contrary, the Shares acquired hereunder may
be pledged by Investor in connection with a bona fide margin agreement, which shall not be deemed to be a transfer, sale or assignment
of the Shares hereunder, and the Investor effecting a pledge of Shares shall not be required to provide Lilium Holdco with any notice
thereof or otherwise make any delivery to Lilium Holdco pursuant to this Subscription Agreement. Lilium Holdco hereby agrees to execute
and deliver such documentation as a pledgee of the Shares may reasonably request in connection with a pledge of the Shares to such pledgee
by the Investor; provided such pledge shall be (i) pursuant to an available exemption from the registration requirements of the Securities
Act or (ii) pursuant to, and in accordance with, a registration statement that is effective under the Securities Act at the time of such
pledge, and the Investor effecting a pledge of Shares shall not be required to provide Lilium Holdco with any notice thereof; provided,
however, that neither Lilium Holdco or their counsel shall be required to take any action (or refrain from taking any action) in connection
with any such pledge, other than providing any such lender of such margin agreement with an acknowledgment that the Shares are not subject
to any contractual prohibition on pledging or lock-up, the form of such acknowledgment to be subject to review and comment by Lilium Holdco
in all respects.

 

    5

     

    

 

7.                  
 Qell Representations and Warranties. Qell represents and warrants to the Investor, as of the date hereof and as of the
Closing Date, that:

 

(a)                
Qell is duly incorporated and validly existing as a corporation in good standing under the laws of the Cayman Islands, with corporate
power to own, lease and operate its properties and conduct its business and to enter into, deliver and perform its obligations under this
Subscription Agreement.

 

(b)               
This Subscription Agreement has been duly authorized, executed and delivered by Qell and, assuming that this Subscription Agreement
constitutes the valid and binding agreement of the Investor, this Subscription Agreement is enforceable against Qell in accordance with
its terms, except as may be limited or otherwise affected by (i) bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium
or other laws relating to or affecting the rights of creditors generally, or (ii) principles of equity, whether considered at law or equity.

 

(c)                
The execution, delivery and performance of this Subscription Agreement will not conflict with or result in a breach or violation
of any of the terms or provisions of, or constitute a default under, or result in the creation or imposition of any lien, charge or encumbrance
upon any of the property or assets of Qell or any of its subsidiaries pursuant to the terms of (i) any indenture, mortgage, deed of trust,
loan agreement, lease, license or other agreement or instrument to which Qell or any of its subsidiaries is a party or by which Qell or
any of its subsidiaries is bound or to which any of the property or assets of Qell is subject that would reasonably be expected to have
a material adverse effect on the business, financial condition or results of operations of Qell and its subsidiaries, taken as a whole
(a “Qell Material Adverse Effect”), or materially affect the legal authority of Qell to comply in all material respects
with its obligations under this Subscription Agreement; (ii) result in any violation of the provisions of the organizational documents
of Qell; or (iii) result in any violation of any statute or any judgment, order, rule or regulation of any court or governmental agency
or body, domestic or foreign, having jurisdiction over Qell or any of its properties that would reasonably be expected to have a Qell
Material Adverse Effect.

 

(d)               
A copy of each form, report, statement, schedule, prospectus, proxy, registration statement and other document filed by Qell on
or prior to the Closing Date (the “Qell SEC Documents”) is available to the undersigned via the SEC’s EDGAR system.
As of their respective dates, all reports required to be filed by Qell with the SEC complied in
all material respects with the applicable requirements of the Securities Act and/or the Exchange Act, and the rules and regulations of
the SEC promulgated thereunder. None of the Qell SEC Documents contained, when filed or, if amended, as of the date of such amendment
with respect to those disclosures that are amended, any untrue statement of a material fact or omitted to state a material fact required
to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.
The financial statements of Qell included in the Qell SEC Documents comply in all material respects
with applicable accounting requirements and the rules and regulations of the SEC with respect thereto as in effect at the time of filing
and fairly present in all material respects the financial position of Qell as of and for the dates thereof and the results of operations
and cash flows for the periods then ended, subject, in the case of unaudited statements, to normal, year-end audit adjustments.
Qell has timely filed each report, statement, schedule, prospectus, and registration statement that Qell was required to file with the
SEC since its inception. There are no material outstanding or unresolved comments in comment letters from the staff of the Division
of Corporation Finance of the SEC with respect to any of the Qell SEC Documents.

 

(e)                
Qell is in compliance with all applicable laws, except where such non-compliance would not reasonably be expected to have, individually
or in the aggregate, a Qell Material Adverse Effect. As of the date hereof, Qell has not received any written communication from a governmental
authority that alleges that Qell is not in compliance with or is in default or violation of any applicable law, except where such non-compliance,
default or violation would not reasonably be expected to have, individually or in the aggregate, a Qell Material Adverse Effect.

 

(f)                 
Except for such matters as have not had and would not be reasonably likely to have, individually or in the aggregate, a Qell Material
Adverse Effect, there is no (i) action, suit, claim or other proceeding, in each case by or before any governmental authority pending,
or, to the knowledge of Qell, threatened against Qell, or (ii) judgment, decree, injunction, ruling or order of any governmental entity
or arbitrator outstanding against Qell.

 

(g)                 Qell
is not in default or violation (and no event has occurred which, with notice or the lapse of time or both, would constitute a
default or violation) of any term, condition or provision of (i) the organizational documents of Qell, (ii) any loan or credit
agreement, note, bond, mortgage, indenture, lease or other agreement, permit, franchise or license to which Qell is now a party or
by which Qell’s properties or assets are bound or (iii) any statute or any judgment, order, rule or regulation of any court or
governmental agency or body, domestic or foreign, having jurisdiction over Qell or any of its properties, except, in the case of
clauses (ii) and (iii), for defaults or violations that have not had and would not reasonably be expected to have, individually or
in the aggregate, a Material Adverse Effect.

 

    6

     

    

 

(h)               
As of the date hereof, the issued and outstanding Class A ordinary shares of Qell are
registered pursuant to Section 12(b) of the Exchange Act, and are listed for trading on the Nasdaq under the symbol “QELL”
(it being understood that the trading symbol will be changed in connection with the Transaction). There is
no suit, action, proceeding or investigation pending or, to the knowledge of Qell, threatened against Qell by Nasdaq or the SEC with respect
to any intention by such entity to prohibit or terminate the listing of Qell’s Class A ordinary shares (or, when registered and
issued in connection with the Transaction, the Shares) or to deregister Qell’s Class A ordinary shares (or, when registered and
issued in connection with the Transaction, the Shares) under the Exchange Act. Qell has taken no action that is designed to terminate
the registration of its Class A ordinary shares under the Exchange Act, other than in connection with the Transaction and subsequent registration
under the Exchange Act of the Shares.

 

8.                  
Investor Representations and Warranties. The Investor represents and warrants to Lilium Holdco, as of the date hereof and
as of the Closing Date, that:

 

(a)               
The Investor (i) is a “qualified institutional buyer” (as defined in Rule 144A under the Securities Act)
or an institutional “accredited investor” (within the meaning of Rule 501(a)(1), (2), (3), (7) or (8) under the Securities
Act), in each case, satisfying the applicable requirements set forth on Schedule A, (ii) is acquiring the Shares only
for its own account and not for the account of others, or if the Investor is subscribing for the Shares as a fiduciary or agent for one
or more investor accounts, the Investor has full investment discretion with respect to each such account, and the full power and authority
to make the acknowledgements, representations and agreements herein on behalf of each owner of each such account, and (iii) is not
acquiring the Shares with a view to, or for offer or sale in connection with, any distribution thereof in violation of the Securities
Act (and shall provide the requested information set forth on Schedule A). The Investor is not an entity formed for the specific
purpose of acquiring the Shares and is an “institutional account” as defined by FINRA Rule 4512(c).

 

(b)               
The Investor acknowledges and agrees that the Shares are being offered in a transaction not involving any public offering within
the meaning of the Securities Act, that the Shares have not been registered under the Securities Act and that Lilium Holdco is not required
to register the Shares except as set forth in Section 9 of this Subscription Agreement. The Investor acknowledges and agrees
that the Shares may not be offered, resold, transferred, pledged or otherwise disposed of by the Investor absent an effective registration
statement under the Securities Act except (i) to Lilium Holdco or a subsidiary thereof, (ii) to non-U.S. persons pursuant to
offers and sales that occur outside the United States within the meaning of Regulation S under the Securities Act or (iii) pursuant
to another applicable exemption from the registration requirements of the Securities Act, and, in each case, in accordance with any applicable
securities laws of the states of the United States and other applicable jurisdictions, and that any certificates representing the Shares
shall contain a restrictive legend to such effect. The Investor acknowledges and agrees that the Shares will be subject to these securities
law transfer restrictions and, as a result of these transfer restrictions, the Investor may not be able to readily offer, resell, transfer,
pledge or otherwise dispose of the Shares and may be required to bear the financial risk of an investment in the Shares for an indefinite
period of time. The Investor acknowledges and agrees that the Shares will not immediately be eligible for offer, resale, transfer, pledge
or disposition pursuant to Rule 144 promulgated under the Securities Act, and that the provisions of Rule 144(i) will apply to the
Shares. The Investor acknowledges and agrees that it has been advised to consult legal, tax and accounting prior to making any offer,
resale, transfer, pledge or disposition of any of the Shares.

 

(c)                
The Investor acknowledges and agrees that the Investor is purchasing the Shares from Lilium Holdco. The Investor further acknowledges
that there have been no representations, warranties, covenants and agreements made to the Investor by or on behalf of Qell, Lilium Holdco,
Lilium, any of their respective affiliates or any control persons, officers, directors, employees, agents or representatives of any of
the foregoing or any other person or entity, expressly or by implication, other than those representations, warranties, covenants and
agreements of Lilium Holdco and Qell expressly set forth in Section 5 and Section 7 respectively of this Subscription
Agreement.

 

    7

     

    

 

(d)               
 The Investor acknowledges and agrees that the Investor has received such information as the Investor deems necessary to make an
investment decision with respect to the Shares, including, with respect to Qell, Lilium Holdco, the Transaction and the business of Lilium
and its subsidiaries. Without limiting the generality of the foregoing, the Investor acknowledges that it has reviewed, or has an adequate
opportunity to review, Qell’s filings with the SEC. The Investor acknowledges and agrees that the Investor and the Investor’s
professional advisor(s), if any, have had the full opportunity to ask such questions, receive such answers and obtain such information
as the Investor and such Investor’s professional advisor(s), if any, have deemed necessary to make an investment decision with respect
to the Shares.

 

(e)                
The Investor became aware of this offering of the Shares solely by means of direct contact between the Investor and Qell, Lilium
Holdco, Lilium or a representative of Qell, Lilium Holdco (including the Placement Agents) or Lilium, and the Shares were offered to the
Investor solely by direct contact between the Investor and Qell, Lilium Holdco, Lilium or a representative of Qell, Lilium Holdco or Lilium.
The Investor did not become aware of this offering of the Shares, nor were the Shares offered to the Investor, by any other means. The
Investor acknowledges that the Shares (i) were not offered by any form of general solicitation or general advertising and (ii) are
not being offered in a manner involving a public offering under, or in a distribution in violation of, the Securities Act, or any state
securities laws. The Investor acknowledges that it is not relying upon, and has not relied upon, any statement, representation or warranty
made by any person, firm or corporation (including, without limitation, Qell, Lilium Holdco, Lilium, the Placement Agents, any of their
respective affiliates or any control persons, officers, directors, employees, agents or representatives of any of the foregoing), other
than the representations and warranties of Lilium Holdco and Qell contained in Section 5 and Section 7, respectively
of this Subscription Agreement, in making its investment or decision to invest in Lilium Holdco.

 

(f)                 
The Investor acknowledges that it is aware that there are substantial risks incident to the purchase and ownership of the Shares,
including those set forth in Qell’s filings with the SEC. The Investor has such knowledge and experience in financial and business
matters as to be capable of evaluating the merits and risks of an investment in the Shares, and the Investor has sought such accounting,
legal and tax advice as the Investor has considered necessary to make an informed investment decision. The Investor acknowledges that
Investor shall be responsible for any of the Investor’s tax liabilities that may arise as a result of the transactions contemplated
by this Subscription Agreement, and that neither Qell, Lilium Holdco nor Lilium has provided any tax advice or any other representation
or guarantee regarding the tax consequences of the transactions contemplated by the Subscription Agreement.

 

(g)               
Alone, or together with any professional advisor(s), the Investor has adequately analyzed and fully considered the risks of an
investment in the Shares and determined that the Shares are a suitable investment for the Investor and that the Investor is able at this
time and in the foreseeable future to bear the economic risk of a total loss of the Investor’s investment in Lilium Holdco. The
Investor acknowledges specifically that a possibility of total loss exists.

 

(h)                 Without
limiting the generality of the foregoing, the Investor has not relied on any statements or other information provided by or on
behalf of any of the Placement Agents or any of its respective affiliates or any control persons, officers, directors, employees,
agents or representatives of any of the foregoing concerning Qell, Lilium Holdco, Lilium, the Transaction, the Transaction
Agreement, this Subscription Agreement or the transactions contemplated hereby or thereby, the Shares or the offer and sale of the
Shares. Without limitation of the foregoing, the Investor hereby further acknowledges and agrees that (i) the Placement Agents are
acting solely as placement agents in connection with the transactions contemplated hereby and are not acting as an underwriter,
initial purchaser, dealer or in any other such capacity and is not and shall not be construed as a fiduciary for the Investor, Qell,
Lilium Holdco, Lilium or any other person or entity in connection with the transactions contemplated hereby, (ii) the Placement
Agents have not made and will not make any representation or warranty, whether express or implied, of any kind or character and have
not provided any advice or recommendation in connection with the transactions contemplated hereby, (iii) the Placement Agents will
have no responsibility with respect to (A) any representations, warranties or agreements made by any person or entity under or in
connection with the transactions contemplated hereby or any of the documents furnished pursuant thereto or in connection therewith,
or the execution, legality, validity or enforceability (with respect to any person) of any thereof, or (B) the financial condition,
business, or any other matter concerning Qell, Lilium Holdco, Lilium and the transactions contemplated hereby, and (iv) no Placement
Agent shall have any liability or obligation (including without limitation, for or with respect to any losses, claims, damages,
obligations, penalties, judgments, awards, liabilities, costs, expenses or disbursements incurred by Investor), whether in contract,
tort or otherwise, to the Investor or to any person claiming through the Investor, in respect of the PIPE Investment.

 

    8

     

    

 

(i)                 
The Investor acknowledges that no federal or state agency has passed upon or endorsed the merits of the offering of the Shares
or made any findings or determination as to the fairness of this investment.

 

(j)                 
The Investor has been duly formed or incorporated and is validly existing and is in good standing under the laws of its jurisdiction
of formation or incorporation, and has the requisite power and authority to enter into, deliver and perform its obligations under this
Subscription Agreement.

 

(k)               
The execution, delivery and performance by the Investor of this Subscription Agreement are within the powers of the Investor, have
been duly authorized and will not constitute or result in a breach or default under or conflict with any order, ruling or regulation of
any court or other tribunal or of any governmental commission or agency, or any agreement or other undertaking, to which the Investor
is a party or by which the Investor is bound, and will not violate any provisions of the Investor’s organizational documents, including,
without limitation, its incorporation or formation papers, bylaws, indenture of trust or partnership or operating agreement, as may be
applicable. The signature of the Investor on this Subscription Agreement is genuine, and the signatory has legal competence and capacity
to execute the same or the signatory has been duly authorized to execute the same, and, assuming that this Subscription Agreement constitutes
the valid and binding agreement of Lilium Holdco and Qell, this Subscription Agreement constitutes a legal, valid and binding obligation
of the Investor, enforceable against the Investor in accordance with its terms except as may be limited or otherwise affected by (i) bankruptcy,
insolvency, fraudulent conveyance, reorganization, moratorium or other laws relating to or affecting the rights of creditors generally,
and (ii) principles of equity, whether considered at law or equity.

 

(l)                 
Neither the Investor nor any of its officers, directors, managers, managing members, general partners or any other person acting
in a similar capacity or carrying out a similar function, is (i) a person named on the Specially Designated Nationals and Blocked
Persons List, the Foreign Sanctions Evaders List, the Sectoral Sanctions Identification List, or any other similar list of sanctioned
persons administered by the U.S. Treasury Department’s Office of Foreign Assets Control (“OFAC”),
or any similar list of sanctioned persons administered by the European Union or any individual European Union member state, including
the United Kingdom (collectively, “Sanctions
Lists”); (ii) directly or indirectly owned or controlled by, or acting on behalf of, one or more persons on a Sanctions
List; (iii) organized, incorporated, established, located, resident or, except to the extent disclosed by the Investor to Lilium
Holdco, born in, or a citizen, national, or the government, including any political subdivision, agency, or instrumentality thereof, of,
Cuba, Iran, North Korea, Syria, Venezuela, the Crimea region of Ukraine, or any other country or territory embargoed or subject to substantial
trade restrictions by the United States, the European Union or any individual European Union member state, including the United Kingdom;
(iv) a Designated National as defined in the Cuban Assets Control Regulations, 31 C.F.R. Part 515; or (v) a non-U.S. shell bank
or providing banking services indirectly to a non-U.S. shell bank (collectively, a “Prohibited
Investor”). The Investor represents that if it is a financial institution subject to the Bank Secrecy Act (31 U.S.C.
Section 5311 et seq.) (the “BSA”),
as amended by the USA PATRIOT Act of 2001 (the “PATRIOT
Act”), and its implementing regulations (collectively, the “BSA/PATRIOT
Act”), that the Investor maintains policies and procedures reasonably designed to comply with applicable obligations
under the BSA/PATRIOT Act. The Investor also represents that it maintains policies and procedures reasonably designed to ensure compliance
with sanctions administered by the United States, the European Union, or any individual European Union member state, including the United
Kingdom, to the extent applicable to it. The Investor further represents that it maintains policies and procedures reasonably designed
to ensure the funds held by the Investor and used to purchase the Shares were legally derived and were not obtained, directly or indirectly,
from a Prohibited Investor.

 

(m)                 If
the Investor is or is acting on behalf of (i) an employee benefit plan that is subject to Title I of the Employee
Retirement Income Security Act of 1974, as amended (“ERISA”),
(ii) a plan, an individual retirement account or other arrangement that is subject to Section 4975 of the Internal Revenue
Code of 1986, as amended (the “Code”),
(iii) an entity whose underlying assets are considered to include “plan assets” of any such plan, account or
arrangement described in clauses (i) and (ii) (each, an “ERISA
Plan”), or (iv) an employee benefit plan that is a governmental plan (as defined in Section 3(32) of
ERISA), a church plan (as defined in Section 3(33) of ERISA), a non-U.S. plan (as described in Section 4(b)(4) of ERISA)
or other plan that is not subject to the foregoing clauses (i), (ii) or (iii) but may be subject to provisions under any other
federal, state, local, non-U.S. or other laws or regulations that are similar to such provisions of ERISA or the Code (collectively,
 “Similar
Laws,” and together with ERISA Plans, “Plans”),
the Investor represents and warrants that (A) it has not relied on Qell, Lilium Holdco or any of their respective affiliates
for investment advice or as the Plan’s fiduciary, with respect to its decision to acquire and hold the Shares, and it is not
relying, and shall not rely on, any party to the Transaction to be the Plan’s fiduciary with respect to any decision in
connection with the Investor’s investment in the Shares; and (B) its purchase of the Shares will not constitute a
non-exempt prohibited transaction under Section 406 of ERISA or Section 4975 of the Code, or any applicable Similar
Law.

 

    9

     

    

 

(n)               
The Investor agrees that, from the date of this Subscription Agreement, none of the Investor or any person or entity acting on
behalf of the Investor or pursuant to any understanding with the Investor will engage in any hedging or other transactions or arrangements
(including, without limitation, any short sale or the purchase or sale of, or entry into, any put or call option, or combination thereof,
forward, swap or any other derivative transaction or instrument, however described or defined) designed or intended, or which could reasonably
be expected to lead to or result in, a sale, loan, pledge or other disposition or transfer (whether by the Investor or any other person)
of any economic consequences of ownership, in whole or in part, directly or indirectly, of any securities of Lilium Holdco prior to the
Closing, whether any such transaction or arrangement (or instrument provided for thereunder) would be settled by delivery of securities
of Lilium Holdco, in cash or otherwise, or to publicly disclose the intention to undertake any of the foregoing; provided, however, that
for purposes of this Section 8(n) only, reference to “short sale” shall not include any short sale, options, puts,
calls, hedging or similar arrangements if, at any point during the day the short sale, option, put, call or similar arrangement is entered
into, the stock price for the Qell common shares is at or above $15 per share (which shall be permitted); provided further that the provisions
of this Section 8(n) shall not apply to long sales (including sales of securities held by the Investor prior to the date of this
Subscription Agreement and securities purchased by the Investor in the open market after the date of this Subscription Agreement). Notwithstanding
the foregoing, nothing in this Section 8(n) (i) shall prohibit any entities under common management with the Investor that have
no knowledge of this Subscription Agreement or of Investor’s participation in the transactions contemplated hereby from entering
into any such transactions; and (ii) in the case of an Investor that is a multi-managed investment vehicle whereby separate portfolio
managers manage separate portions of such Investor’s assets and the portfolio managers have no knowledge of the investment decisions
made by the portfolio managers managing other portions of such Investor’s assets, this Section 8(n) shall only apply with
respect to the portion of assets managed by the portfolio manager that made the investment decision to purchase the Shares hereunder.

 

(o)               
The Investor acknowledges that it has been advised by the Placement Agents (as defined below) that no disclosure or offering document
has been prepared by J.P. Morgan Securities LLC, Barclays Capital Inc. and Citigroup Global Markets Inc. (the “Placement
Agents”) or any of its affiliates in connection with the offer and sale of the Shares.

 

(p)               
The Investor acknowledges that it has been advised by the Placement Agents that none of the Placement Agents, nor any of their
affiliates, nor any control persons, officers, directors, employees, agents or representatives of any of the foregoing has made any independent
investigation with respect to Qell, Lilium Holdco, Lilium or its subsidiaries or any of their respective businesses, or the Shares or
the accuracy, completeness or adequacy of any information supplied to the Investor by Qell, Lilium Holdco or Lilium.

 

(q)               
In connection with the issue and purchase of the Shares, none of the Placement Agent, nor any of its affiliates, has acted as the
Investor’s financial advisor or fiduciary.

 

(r)                 
When required to deliver payment pursuant to Section 2 above, the Investor will have sufficient funds to pay the Subscription
Amount and consummate the purchase and sale of the Shares pursuant to this Subscription Agreement.

 

(s)                
The Investor (for itself and for each account for which the Investor is acquiring the Shares) acknowledges that the Investor is
aware that Citigroup Global Markets Inc. is acting as one of Qell’s placement agents and Citigroup Global Markets Inc. is acting
as financial advisor to Lilium in connection with the Transaction.

 

    10

     

    

 

9.                  
Registration Rights.

 

(a)                
 Lilium Holdco agrees that, within thirty (30) calendar days following the Closing Date (such deadline, the “Filing Deadline”),
Lilium Holdco will submit to or file with the SEC a registration statement for a shelf registration on Form F-1 or Form F-3 (if Lilium
Holdco is then eligible to use a Form F-3 shelf registration) (the “Registration
Statement”), in each case, covering the resale of the Shares acquired by the Investor pursuant to this Subscription Agreement
(the “Registrable Shares”) and Lilium Holdco shall use its commercially reasonable efforts to have the Registration
Statement declared effective as soon as practicable after the filing thereof, but no later than the earlier of (i) the 60th calendar
day (or 90th calendar day if the SEC notifies Lilium Holdco that it will “review” the Registration Statement) following
the Closing and (ii) the 10th business day after the date Lilium Holdco is notified (orally or in writing, whichever is earlier)
by the SEC that the Registration Statement will not be “reviewed” or will not be subject to further review (such earlier date,
the “Effectiveness Deadline”);
provided, however, that if such Effectiveness Deadline falls on a Saturday, Sunday, or other day that the SEC is closed
for business, the Effectiveness Deadline shall be extended to the next business day on which the SEC is open for business; and provided
further,  that Lilium Holdco’s obligations to include the Registrable Shares in the Registration Statement are contingent
upon Investor furnishing in writing to Lilium Holdco such information regarding Investor or its permitted assigns, the securities of Lilium
Holdco held by Investor and the intended method of disposition of the Registrable Shares (which shall be limited to non-underwritten public
offerings) as shall be reasonably requested by Lilium Holdco to effect the registration of the Registrable Shares, and Investor shall
execute such documents in connection with such registration as Lilium Holdco may reasonably request that are customary of a selling stockholder
in similar situations, including providing that Lilium Holdco shall be entitled to postpone and suspend the effectiveness or use of the
Registration Statement, if applicable, as permitted hereunder; provided that Investor shall not in connection with the foregoing
be required to execute any lock-up or similar agreement or otherwise be subject to any contractual restriction on the ability to transfer
the Registrable Shares. In no event shall Investor be identified as a statutory underwriter in the Registration Statement unless specifically
requested by the SEC in which case the Investor will have an opportunity to withdraw from the Registration Statement. Notwithstanding
the foregoing, if the SEC prevents Lilium Holdco from including any or all of the Shares proposed to be registered under the Registration
Statement due to limitations on the use of Rule 415 of the Securities Act for the resale of the Registrable Shares or otherwise, such
Registration Statement shall register the resale of a number of Shares which is equal to the maximum number of Shares as is permitted
by the SEC. In such event, the number of Shares to be registered for each selling shareholder named in the Registration Statement shall
be reduced pro rata among all such selling shareholders, and Lilium Holdco will use its commercially reasonable efforts to file with the
SEC, as promptly as allowed by the SEC, one or more registration statements to register the resale of those Registrable Shares that were
not registered on the initial Registration Statement, as so amended. For as long as the Investor holds Shares, Lilium Holdco will use
commercially reasonable efforts to file all reports for so long as the condition in Rule 144(c)(1) (or Rule 144(i)(2), if applicable)
is required to be satisfied, and provide all customary and reasonable cooperation, necessary to enable the undersigned to resell the Shares
pursuant to Rule 144 of the Securities Act (in each case, when Rule 144 of the Securities Act becomes available to the Investor). Any
failure by Lilium Holdco to file the Registration Statement by the Filing Deadline or to effect such Registration Statement by the Effectiveness
Deadline shall not otherwise relieve Lilium Holdco of its obligations to file or effect the Registration Statement as set forth above
in this Section 9.

 

(b)               
In the case of the registration effected by Lilium Holdco pursuant to this Subscription Agreement, Lilium Holdco shall, upon reasonable
request, inform the Investor as to the status of such registration. At its expense Lilium Holdco shall:

 

(i)                  except
for such times as Lilium Holdco is permitted hereunder to suspend the use of the prospectus forming part of a Registration
Statement, use its commercially reasonable efforts to keep such registration, and any qualification, exemption or compliance under
state securities laws which Lilium Holdco determines to obtain, continuously effective with respect to Investor, and to keep the
applicable Registration Statement or any subsequent shelf registration statement free of any material misstatements or omissions,
until the earlier of the following: (A) Investor ceases to hold any Registrable Shares, (B) the date all Registrable
Shares held by Investor may be sold without restriction under Rule 144, including without limitation, any volume and manner of sale
restrictions which may be applicable to affiliates under Rule 144 and without the requirement for Lilium Holdco to be in compliance
with the current public information required under Rule 144(c)(1) (or Rule 144(i)(2), if applicable), and (C) three (3) years
from the date of effectiveness of the Registration Statement. The Investor agrees to disclose its ownership to Lilium Holdco upon
request to assist it in making the determination described above. The period of time during which Lilium Holdco is required
hereunder to keep a Registration Statement effective is referred to herein as the “Registration
Period”;

 

    11

     

    

 

(ii)               
during the Registration Period, advise Investor, as expeditiously as possible (and within no later than three (3) business days):

 

(1)                when
a Registration Statement or any amendment thereto has been filed with the SEC;

 

(2)                after
it shall receive notice or obtain knowledge thereof, of the issuance by the SEC of any stop order suspending the effectiveness of any
Registration Statement or the initiation of any proceedings for such purpose;

 

(3)                of
the receipt by Lilium Holdco of any notification with respect to the suspension of the qualification of the Registrable Shares included
therein for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose; and

 

(4)                subject
to the provisions in this Subscription Agreement, of the occurrence of any event that requires the making of any changes in any Registration
Statement or prospectus so that, as of such date, the statements therein are not misleading and do not omit to state a material fact
required to be stated therein or necessary to make the statements therein (in the case of a prospectus, in the light of the circumstances
under which they were made) not misleading.

 

Notwithstanding anything to the contrary set forth
herein, Lilium Holdco shall not, when so advising Investor of such events, provide Investor with any material, nonpublic information regarding
Lilium Holdco other than to the extent that providing notice to Investor of the occurrence of the events listed in (1) through (4)
above may constitute material, nonpublic information regarding Lilium Holdco;

 

(iii)             
during the Registration Period, use its commercially reasonable efforts to obtain the withdrawal of any order suspending the effectiveness
of any Registration Statement as soon as reasonably practicable;

 

(iv)              during
the Registration Period, upon the occurrence of any event contemplated in Section 9(b)(ii)(4) above, except for such times as
Lilium Holdco is permitted hereunder to suspend, and has suspended, the use of a prospectus forming part of a Registration Statement,
Lilium Holdco shall use its commercially reasonable efforts to as soon as reasonably practicable prepare a post-effective amendment to
such Registration Statement or a supplement to the related prospectus, or file any other required document so that, as thereafter delivered
to purchasers of the Registrable Shares included therein, such prospectus will not include any untrue statement of a material fact or
omit to state any material fact necessary to make the statements therein, in the light of the circumstances under which they were made,
not misleading;

 

(v)               during
the Registration Period, use its commercially reasonable efforts to cause all Registrable Shares to be listed on each securities exchange
or market, if any, on which the shares of common stock issued by Lilium Holdco have been listed;

 

(vi)              during
the Registration Period, use its commercially reasonable efforts to allow the Investor to review disclosure regarding the Investor in
the Registration Statement; and

 

(vii)             during
the Registration Period, otherwise, in good faith, cooperate reasonably with, and take such customary actions as may reasonably be requested
by the Investor, consistent with the terms of this Subscription Agreement, in connection with the registration of the Registrable Shares.

 

    12

     

    

 

(c)                
 Notwithstanding anything to the contrary in this Subscription Agreement, Lilium Holdco shall be entitled to delay the filing or
effectiveness of, or suspend the use of, the Registration Statement if it determines that in order for the Registration Statement not
to contain a material misstatement or omission, (i) an amendment thereto would be needed to include information that would at that time
not otherwise be required in a current, quarterly, or annual report under the Exchange Act, or (ii) the negotiation or consummation of
a transaction by Lilium Holdco or its subsidiaries is pending or an event has occurred, which negotiation, consummation or event Lilium
Holdco’s board of directors reasonably believes, upon the advice of outside legal counsel, would require additional disclosure by
Lilium Holdco in the Registration Statement of material information that Lilium Holdco has a bona fide business purpose for keeping confidential
and the non-disclosure of which in the Registration Statement would be expected, in the reasonable determination of Lilium Holdco’s
board of directors, upon the advice of outside legal counsel, to cause the Registration Statement to fail to comply with applicable disclosure
requirements, (each such circumstance, a “Suspension
Event”); provided, however, that Lilium Holdco may not delay or suspend the Registration Statement on more
than two occasions or for more than forty-five (45) consecutive calendar days, or more than ninety (90) total calendar days in each
case during any twelve-month period. Upon receipt of any written notice from Lilium Holdco of the happening of any Suspension Event during
the period that the Registration Statement is effective or if as a result of a Suspension Event the Registration Statement or related
prospectus contains any untrue statement of a material fact or omits to state any material fact required to be stated therein or necessary
to make the statements therein (in light of the circumstances under which they were made, in the case of the prospectus) not misleading,
Investor agrees that (i) it will immediately discontinue offers and sales of the Registrable Shares under the Registration Statement
(excluding, for the avoidance of doubt, sales conducted pursuant to Rule 144) until Investor receives copies of a supplemental or amended
prospectus (which Lilium Holdco agrees to promptly prepare) that corrects the misstatement(s) or omission(s) referred to above and receives
notice that any post-effective amendment has become effective or unless otherwise notified by Lilium Holdco that it may resume such offers
and sales, and (ii) it will maintain the confidentiality of any information included in such written notice delivered by Lilium Holdco
unless otherwise required by law or subpoena. If so directed by Lilium Holdco, Investor will deliver to Lilium Holdco or, in Investor’s
sole discretion destroy, all copies of the prospectus covering the Registrable Shares in Investor’s possession; provided,
however, that this obligation to deliver or destroy all copies of the prospectus covering the Registrable Shares shall not apply (A) to
the extent Investor is required to retain a copy of such prospectus (1) to comply with applicable legal, regulatory, self-regulatory
or professional requirements or (2) in accordance with a bona fide pre-existing document retention policy or (B) to copies stored
electronically on archival servers as a result of automatic data back-up. The Investor may deliver written notice (an “Opt-Out Notice”)
to Lilium Holdco requesting that Investor not receive notices from Lilium Holdco otherwise required by this Section 9(c); provided,
however, that Investor may later revoke any such Opt-Out Notice in writing. Following receipt of an Opt-Out Notice from Investor (unless
subsequently revoked), (i) Lilium Holdco shall not deliver any such notices to Investor and Investor shall no longer be entitled to the
rights associated with any such notice and (ii) each time prior to Investor’s intended use of an effective Registration Statement,
Investor will notify Lilium Holdco in writing at least two (2) business days in advance of such intended use, and if a notice of a Suspension
Event was previously delivered (or would have been delivered but for the provisions of this Section 9(c)) and the related suspension
period remains in effect, Lilium Holdco will so notify Investor, within one (1) business day of Investor’s notification to Lilium
Holdco, by delivering to Investor a copy of such previous notice of Suspension Event, and thereafter will provide Investor with the related
notice of the conclusion of such Suspension Event promptly following its availability.

 

(d)                 
Indemnification.

 

(i)                Lilium
Holdco agrees to indemnify, to the extent permitted by law, the Investor (to the extent a seller under the Registration Statement),
its directors, officers, partners, managers, members, stockholders, advisers and each person who controls Investor (within the
meaning of the Securities Act), to the extent permitted by law, against all losses, claims, damages, liabilities and reasonable and
documented out of pocket expenses (including reasonable and documented attorneys’ fees of one law firm (and one firm of local
counsel)) caused by any untrue or alleged untrue statement of material fact contained in any Registration Statement, prospectus
included in any Registration Statement (“Prospectus”)
or preliminary Prospectus or any amendment thereof or supplement thereto or any omission or alleged omission of a material fact
required to be stated therein or necessary to make the statements therein (in the case of a Prospectus, in the light of the
circumstances under which they were made) not misleading, except insofar as the same are caused by or contained in any information
or affidavit so furnished in writing to Lilium Holdco by or on behalf of such Investor expressly for use therein.

 

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(ii)               
In connection with any Registration Statement in which an Investor is participating, such Investor shall furnish (or cause to be
furnished) to Lilium Holdco in writing such information and affidavits as Lilium Holdco reasonably requests for use in connection with
any such Registration Statement or Prospectus and, to the extent permitted by law, shall indemnify Lilium Holdco, its directors and officers
and each person or entity who controls Lilium Holdco (within the meaning of the Securities Act) against any losses, claims, damages, liabilities
and expenses (including, without limitation, reasonable outside attorneys’ fees) resulting from any untrue or alleged untrue statement
of material fact contained or incorporated by reference in any Registration Statement, Prospectus or preliminary Prospectus or any amendment
thereof or supplement thereto or any omission or alleged omission of a material fact required to be stated therein or necessary to make
the statements therein (in the case of a Prospectus, in the light of the circumstances under which they were made) not misleading, but
only to the extent that such untrue statement or omission is contained (or not contained in, in the case of an omission) in any information
or affidavit so furnished in writing by on behalf of such Investor expressly for use therein; provided, however, that the
liability of such Investor shall be several and not joint with any Other Investor or other selling stockholder named in the Registration
Statement and shall be in proportion to and limited to the net proceeds received by such Investor from the sale of Registrable Shares
giving rise to such indemnification obligation.

 

(iii)             
Any person or entity entitled to indemnification herein shall (A) give prompt written notice to the indemnifying party of any claim
with respect to which it seeks indemnification (provided that the failure to give prompt notice shall not impair any person’s
or entity’s right to indemnification hereunder to the extent such failure has not prejudiced the indemnifying party) and (B) unless
in such indemnified party’s reasonable judgment a conflict of interest between such indemnified and indemnifying parties may exist
with respect to such claim, permit such indemnifying party to assume the defense of such claim with counsel reasonably satisfactory to
the indemnified party. If such defense is assumed, the indemnifying party shall not be subject to any liability for any settlement made
by the indemnified party without its consent (but such consent shall not be unreasonably withheld). An indemnifying party who is not entitled
to, or elects not to, assume the defense of a claim shall not be obligated to pay the fees and expenses of more than one counsel for all
parties indemnified by such indemnifying party with respect to such claim, unless in the reasonable judgment of any indemnified party
a conflict of interest may exist between such indemnified party and any other of such indemnified parties with respect to such claim.
No indemnifying party shall, without the consent of the indemnified party, consent to the entry of any judgment or enter into any settlement
which cannot be settled in all respects by the payment of money (and such money is so paid by the indemnifying party pursuant to the terms
of such settlement) or which settlement includes a statement or admission of fault and culpability on the part of such indemnified party
or which does not include as an unconditional term thereof the giving by the claimant or plaintiff to such indemnified party of a release
from all liability in respect to such claim or litigation. 

 

(iv)             
The indemnification provided for under this Subscription Agreement shall remain in full force and effect regardless of any investigation
made by or on behalf of the indemnified party or any officer, director or controlling person or entity of such indemnified party and shall
survive the transfer of securities. 

 

(v)               If
the indemnification provided under this Section 9(d) from the indemnifying party is unavailable or insufficient to hold
harmless an indemnified party in respect of any losses, claims, damages, liabilities and expenses referred to herein, then the
indemnifying party, in lieu of indemnifying the indemnified party, shall contribute to the amount paid or payable by the indemnified
party as a result of such losses, claims, damages, liabilities and expenses in such proportion as is appropriate to reflect the
relative fault of the indemnifying party and the indemnified party, as well as any other relevant equitable considerations; provided, however,
that the liability of the Investor shall be limited to the net proceeds received by such Investor from the sale of Registrable
Shares giving rise to such indemnification obligation. The relative fault of the indemnifying party and indemnified party shall be
determined by reference to, among other things, whether any action in question, including any untrue or alleged untrue statement of
a material fact or omission or alleged omission to state a material fact, was made by (or not made by, in the case of an omission),
or relates to information supplied by (or not supplied by, in the case of an omission), such indemnifying party or indemnified
party, and the indemnifying party’s and indemnified party’s relative intent, knowledge, access to information and
opportunity to correct or prevent such action. The amount paid or payable by a party as a result of the losses or other liabilities
referred to above shall be deemed to include, subject to the limitations set forth in Sections 9(d)(i), (ii) and (iii)
above, any legal or other fees, charges or expenses reasonably incurred by such party in connection with any investigation or
proceeding. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be
entitled to contribution pursuant to this Section 9 (d)(v) from any person or entity who was not guilty of such fraudulent
misrepresentation.

 

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(e)                
Subject to receipt from the Investor by Lilium Holdco and its transfer agent (the “Transfer Agent”) of customary representations
and other documentation reasonably acceptable to Lilium Holdco and the Transfer Agent in connection therewith, and, if required by the
Transfer Agent, an opinion of Lilium Holdco’s counsel, in a form reasonably acceptable to the Transfer Agent, to the effect that
the removal of such restrictive legends in such circumstances may be effected under the Securities Act, the Investor may request that
Lilium Holdco remove any legend from the book entry position evidencing the Shares within two (2) business days of such request and receipt
of such representations and other documentation reasonably acceptable to Lilium Holdco and the Transfer Agent, following the earliest
of such time as the Shares (A) are subject to and are sold or transferred pursuant to an effective registration statement or (B) have
been or are about to be sold pursuant to Rule 144. If restrictive legends are no longer required for the Shares pursuant to the foregoing,
Lilium Holdco shall, in accordance with the provisions of this section and reasonably promptly following any request therefor from the
Investor accompanied by such customary and reasonably acceptable representations and other documentation referred to above establishing
that restrictive legends are no longer required, deliver to the Transfer Agent irrevocable instructions that the Transfer Agent shall
make a new, unlegended entry for the Shares. Lilium Holdco shall be responsible for the fees of the Transfer Agent associated with such
issuance.

 

10.               
Termination. This Subscription Agreement shall terminate and be void and of no further force and effect, and all rights
and obligations of the parties hereunder shall terminate without any further liability on the part of any party in respect thereof, upon
the earliest to occur of (a) such date and time as the Transaction Agreement is terminated in accordance with its terms without being
consummated, (b) upon the mutual written agreement of each of the parties hereto to terminate this Subscription Agreement, (c) if
the conditions to Closing set forth in Section 3 of this Subscription Agreement are not satisfied at, or are not capable of being
satisfied on or prior to, the Closing and, as a result thereof, the transactions contemplated by this Subscription Agreement will not
be or are not consummated at the Closing and (d) November 15, 2021 if the closing of the Transaction has not occurred on or before such
date; provided that nothing herein will relieve any party from liability for any willful breach hereof prior to the time of termination,
and each party will be entitled to any remedies at law or in equity to recover losses, liabilities or damages arising from any such willful
breach. Lilium Holdco shall notify the Investor of the termination of the Transaction Agreement promptly after the termination of such
agreement. Upon the termination of this Subscription Agreement in accordance with this Section 10, any monies paid by the
Investor to Lilium Holdco in connection herewith shall be promptly (and in any event within one business day after such termination) returned
to the Investor.

 

11.                Trust
Account Waiver. The Investor acknowledges that Qell is a blank check company with the powers and privileges to effect a merger,
asset acquisition, reorganization or similar business combination involving Qell and one or more businesses or assets. The Investor
further acknowledges that, as described in Qell’s prospectus relating to its initial public offering dated September 11, 2020,
as amended on September 25, 2020 (the “IPO Prospectus”)
available at www.sec.gov, substantially all of Qell’s assets consist of the cash proceeds of Qell’s initial public
offering and private placement of its securities, and substantially all of those proceeds have been deposited in a trust account
(the “Trust
Account”) for the benefit of Qell, its public shareholders and the underwriter of Qell’s initial public
offering. Except with respect to interest earned on the funds held in the Trust Account that may be released to Qell to pay its tax
obligations, if any, the cash in the Trust Account may be disbursed only for the purposes set forth in the IPO Prospectus. For and
in consideration of Qell entering into this Subscription Agreement, the receipt and sufficiency of which are hereby acknowledged,
the Investor hereby irrevocably waives any and all right, title and interest, or any claim of any kind it has or may have in the
future, in or to any monies held in the Trust Account, and agrees not to seek recourse against the Trust Account as a result of, or
arising out of, this Subscription Agreement; provided, that nothing in this Section 11 shall be deemed to limit the
Investor’s right, title, interest or claim to the Trust Account by virtue of the Investor’s record or beneficial
ownership of Class A common stock of Qell.

 

    15

     

    

 

12.               
Miscellaneous.

 

(a)                 Neither
this Subscription Agreement nor any rights that may accrue to the Investor hereunder (other than the Shares acquired hereunder, if any)
may be transferred or assigned provided that the Investor may assign its rights and obligations under this Subscription Agreement to
one or more of its affiliates or to another investment fund or account managed or advised by the investment manager who acts on behalf
of the Investor or an affiliate thereof; provided that no such assignment shall relieve the Investor of its obligations hereunder.

 

(b)               
Lilium Holdco may request from the Investor such additional information as Lilium Holdco may deem necessary to evaluate the eligibility
of the Investor to acquire the Shares and in connection with the inclusion of the Shares in the Registration Statement, and the Investor
shall provide such information as may reasonably be requested, to the extent readily available and to the extent consistent with its internal
policies and procedures; provided that Lilium Holdco agrees to keep any such information confidential, other than as (i) necessary to
include in any Registration Statement, or (ii) may be required by applicable law, rule, regulation or in connection with any legal proceeding
or regulatory request. The Investor acknowledges that Lilium Holdco and/or Qell may file a form of this Subscription Agreement with the
SEC as an exhibit to a current or periodic report or a registration statement of Lilium Holdco and/or Qell.

 

(c)                 The
Investor acknowledges that Qell and Lilium Holdco will rely on the acknowledgments, understandings, agreements, representations and warranties
of the Investor contained in Section 8 this Subscription Agreement. Prior to the Closing, the Investor agrees to promptly notify
Lilium Holdco if any of the acknowledgments, understandings, agreements, representations and warranties of the Investor set forth herein
(i) are no longer accurate and (ii) are not expected to be accurate as of immediately prior to the Closing. The Investor acknowledges
and agrees that the Placement Agents will rely on the representations and warranties of the Investor contained in Section 8 of
this Subscription Agreement.

 

(d)                Qell,
Lilium Holdco, the Placement Agents and the Investor are each irrevocably authorized to produce this Subscription Agreement or a copy
hereof to any interested party in any administrative or legal proceeding or official inquiry with respect to the matters covered hereby.

 

(e)                 All of the representations and warranties contained in this Subscription Agreement shall survive the Closing. All of the covenants
and agreements made by each party hereto in this Subscription Agreement shall survive the Closing until the applicable statute of limitations,
or in accordance with their respective terms.

 

(f)                   This
Subscription Agreement may not be modified, waived or terminated (other than pursuant to the terms of Section 10 above) except
by an instrument in writing, signed by each of the parties hereto. No failure or delay of either party in exercising any right or remedy
hereunder shall operate as a waiver thereof, nor shall any single or partial exercise of any such right or power, or any abandonment
or discontinuance of steps to enforce such right or power, or any course of conduct, preclude any other or further exercise thereof or
the exercise of any other right or power. The rights and remedies of the parties and third party beneficiaries hereunder are cumulative
and are not exclusive of any rights or remedies that they would otherwise have hereunder.

 

(g)               
This Subscription Agreement (including the schedules hereto) constitutes the entire agreement, and supersedes all other prior agreements,
understandings, representations and warranties, both written and oral, among the parties, with respect to the subject matter hereof. Except
as set forth in Section 9(d), Section 12(c) and Section 12(d) with respect to the persons referenced therein,
this Subscription Agreement shall not confer any rights or remedies upon any person other than the parties hereto, and their respective
successor and assigns.

 

    16

     

    

 

(h)               
 Except as otherwise provided herein, this Subscription Agreement shall be binding upon, and inure to the benefit of the parties
hereto and their heirs, executors, administrators, successors, legal representatives, and permitted assigns, and the agreements, representations,
warranties, covenants and acknowledgments contained herein shall be deemed to be made by, and be binding upon, such heirs, executors,
administrators, successors, legal representatives and permitted assigns.

 

(i)                 
If any provision of this Subscription Agreement shall be adjudicated by a court of competent jurisdiction to be invalid, illegal
or unenforceable, the validity, legality or enforceability of the remaining provisions of this Subscription Agreement shall not in any
way be affected or impaired thereby and shall continue in full force and effect.

 

(j)                
This Subscription Agreement may be executed in one or more counterparts (including by electronic mail or in .pdf) and by different
parties in separate counterparts, with the same effect as if all parties hereto had signed the same document. All counterparts so executed
and delivered shall be construed together and shall constitute one and the same agreement.

 

(k)               
The parties hereto acknowledge and agree that irreparable damage would occur in the event that any of the provisions of this Subscription
Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties
shall be entitled to an injunction or injunctions to prevent breaches of this Subscription Agreement, without posting a bond or undertaking
and without proof of damages, to enforce specifically the terms and provisions of this Subscription Agreement, this being in addition
to any other remedy to which such party is entitled at law, in equity, in contract, in tort or otherwise.

 

(l)                 
THE PARTIES HERETO IRREVOCABLY SUBMIT TO THE EXCLUSIVE JURISDICTION OF THE UNITED STATES DISTRICT COURT FOR THE SOUTHERN DISTRICT
OF NEW YORK AND THE SUPREME COURT OF THE STATE OF NEW YORK SOLELY IN RESPECT OF THE INTERPRETATION AND ENFORCEMENT OF THE PROVISIONS OF
THIS SUBSCRIPTION AGREEMENT AND THE DOCUMENTS REFERRED TO IN THIS SUBSCRIPTION AGREEMENT AND IN RESPECT OF THE TRANSACTIONS CONTEMPLATED
HEREBY, AND HEREBY WAIVE, AND AGREE NOT TO ASSERT, AS A DEFENSE IN ANY ACTION, SUIT OR PROCEEDING FOR INTERPRETATION OR ENFORCEMENT HEREOF
OR ANY SUCH DOCUMENT THAT IS NOT SUBJECT THERETO OR THAT SUCH ACTION, SUIT OR PROCEEDING MAY NOT BE BROUGHT OR IS NOT MAINTAINABLE IN
SAID COURTS OR THAT VENUE THEREOF MAY NOT BE APPROPRIATE OR THAT THIS SUBSCRIPTION AGREEMENT OR ANY SUCH DOCUMENT MAY NOT BE ENFORCED
IN OR BY SUCH COURTS, AND THE PARTIES HERETO IRREVOCABLY AGREE THAT ALL CLAIMS WITH RESPECT TO SUCH ACTION, SUIT OR PROCEEDING SHALL BE
HEARD AND DETERMINED BY SUCH A NEW YORK STATE OR FEDERAL COURT. THE PARTIES HEREBY CONSENT TO AND GRANT ANY SUCH COURT JURISDICTION OVER
THE PERSON OF SUCH PARTIES AND OVER THE SUBJECT MATTER OF SUCH DISPUTE AND AGREE THAT MAILING OF PROCESS OR OTHER PAPERS IN CONNECTION
WITH SUCH ACTION, SUIT OR PROCEEDING IN THE MANNER PROVIDED IN SECTION 15 OF THIS SUBSCRIPTION AGREEMENT OR IN SUCH OTHER MANNER
AS MAY BE PERMITTED BY LAW SHALL BE VALID AND SUFFICIENT SERVICE THEREOF. THIS SUBSCRIPTION AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED
IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS THAT WOULD OTHERWISE REQUIRE
THE APPLICATION OF THE LAW OF ANY OTHER STATE.

 

(m)             
EACH PARTY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS SUBSCRIPTION AGREEMENT OR THE TRANSACTIONS
CONTEMPLATED HEREBY IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY
WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING
TO THIS SUBSCRIPTION AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS SUBSCRIPTION AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES
THAT (I) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY
WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER; (II) SUCH PARTY UNDERSTANDS AND HAS CONSIDERED THE
IMPLICATIONS OF THE FOREGOING WAIVER; (III) SUCH PARTY MAKES THE FOREGOING WAIVER VOLUNTARILY; AND (IV) SUCH PARTY HAS BEEN
INDUCED TO ENTER INTO THIS SUBSCRIPTION AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVER AND CERTIFICATIONS IN THIS SECTION 
12(m).

 

    17

     

    

 

13.               
Non-Reliance and Exculpation. The Investor acknowledges that it is not relying upon, and has not relied upon, any statement,
representation or warranty made by any person, firm or corporation (including, without limitation, the Placement Agent, any of its affiliates
or any control persons, officers, directors, employees, partners, agents or representatives of any of the foregoing), other than the statements,
representations and warranties of Lilium Holdco and Qell expressly contained in Section 5 and Section 7, respectively,
of this Subscription Agreement, in making its investment or decision to invest in Lilium Holdco. The Investor acknowledges and agrees
that none of (i) any Other Investor pursuant to this Subscription Agreement or any Other Subscription Agreement related to the private
placement of the Shares (including the investor’s respective affiliates or any control persons, officers, directors, employees,
partners, agents or representatives of any of the foregoing), (ii) the Placement Agent, its affiliates or any control persons, officers,
directors, employees, partners, agents or representatives of any of the foregoing, (iii) any other party to the Transaction Agreement
(other than Lilium Holdco and Qell), or (iv) any affiliates, or any control persons, officers, directors, employees, partners, agents
or representatives of any of Qell, Lilium Holdco, Lilium or any other party to the Transaction Agreement shall be liable to the Investor,
or to any Other Investor, pursuant to this Subscription Agreement or any Other Subscription Agreement related to the private placement
of the Shares, the negotiation hereof or thereof or the subject matter hereof or thereof, or the transactions contemplated hereby or thereby,
for any action heretofore or hereafter taken or omitted to be taken by any of them in connection with the purchase of the Shares.

 

14.               
Press Releases. Qell or Lilium Holdco shall, on or prior to 9:00 a.m., New York City time, on the first business day following
the date hereof, issue one or more press releases or furnish or file with the SEC a Current Report on Form 8-K (collectively, the “Disclosure
Document”) disclosing, to the extent not previously publicly disclosed, the PIPE Investment, all material terms of the Transaction
and any other material, non-public information that Lilium Holdco or Qell has provided to the Investor at any time prior to the filing
of the Disclosure Document. From and after the disclosure of the Disclosure Document, to the knowledge of Lilium Holdco and Qell, the
Investor shall not be in possession of any material, non-public information received from Lilium Holdco, Qell or any of their respective
officers, directors, employees or agents, and the Investor shall no longer be subject to any confidentiality or similar obligations under
any current agreement, whether written or oral, relating to the transactions contemplated by this Subscription Agreement. All press releases
or other public communications relating to the transactions contemplated hereby among Lilium Holdco, Qell and the Investor, and the method
of the release for publication thereof, shall be subject to the prior written approval of (i) Lilium Holdco, and (ii) to the extent such
press release or public communication references the Investor or its affiliates or investment advisers by name, the Investor. The restriction
in this Section 14 shall not apply to the extent the public announcement is required by applicable securities law, any governmental
authority or stock exchange rule; provided, that in such an event, the applicable party shall use its commercially reasonable efforts
to consult with the other party in advance as to its form, content and timing.

 

15.               
Notices. All notices and other communications among the parties shall be in writing and shall be deemed to have been duly
given (i) when delivered in person, (ii) when delivered after posting in the United States mail having been sent registered or certified
mail return receipt requested, postage prepaid, (iii) when delivered by FedEx or other nationally recognized overnight delivery service,
or (iv) when delivered by email (in each case in this clause (iv), solely if receipt is confirmed, but excluding any automated reply,
such as an out-of-office notification), addressed as follows:

 

If to the Investor, to the address provided
on the Investor’s signature page hereto.

 

If to Lilium Holdco to:

 

Qell Acquisition Corp

505 Montgomery Street, Suite 1100

San Francisco, CA 94111

Attention:      The Board of Directors

 

    18

     

    

 

with copies to (which shall not constitute notice), to:

 

Goodwin Procter LLP

100 Northern Avenue

Boston, MA 02210

Attention:     Jocelyn Arel

                       Joshua
Klatzkin

Email:             Jarel@goodwinlaw.com

                       Jklatzkin@goodwinlaw.com

 

or to such other address or addresses as the parties
may from time to time designate in writing. Copies delivered solely to outside counsel shall not constitute notice.

 

16.               
For the avoidance of doubt, all obligations of the Investor hereunder are separate and several from the obligations of any Other
Investor. The decision of Investor to purchase the Shares pursuant to this Subscription Agreement has been made by Investor independently
of any Other Investor or any other investor and independently of any information, materials, statements or opinions as to the business,
affairs, operations, assets, properties, liabilities, results of operations, condition (financial or otherwise) or prospects of Lilium
Holdco, Qell, Lilium, or any of their respective subsidiaries which may have been made or given by any Other Investor or investor or by
any agent or employee of any Other Investor or investor, and neither Investor nor any of its agents or employees shall have any liability
to any Other Investor or investor (or any other person) relating to or arising from any such information, materials, statements or opinions.
Nothing contained herein or in any Other Subscription Agreement, and no action taken by Investor or Other Investors pursuant hereto or
thereto, shall be deemed to constitute Investor and Other Investor or other investors as a partnership, an association, a joint venture
or any other kind of entity, or create a presumption that Investor and Other Investors or other investors are in any way acting in concert
or as a group with respect to such obligations or the transactions contemplated by this Subscription Agreement and the Other Subscription
Agreements. The Investor acknowledges that no Other Investor has acted as agent for Investor in connection with making its investment
hereunder and no Other Investor will be acting as agent of Investor in connection with monitoring its investment in the Shares or enforcing
its rights under this Subscription Agreement. The Investor shall be entitled to independently protect and enforce its rights, including
without limitation the rights arising out of this Subscription Agreement, and it shall not be necessary for any Other Investor or investor
to be joined as an additional party in any proceeding for such purpose.

  

[SIGNATURE PAGES FOLLOW]

 

    19

     

    

 

IN WITNESS WHEREOF,
the Investor has executed or caused this Subscription Agreement to be executed by its duly authorized representative as of the date set
forth below.

 

	Name of Investor:	 	State/Country of Formation or Domicile:
	 	 	 
	By:	 	 	 
	Name: 	 	 	 
	Title: 	 	 	 
	 	 	 	 
	Name in which Shares are to be registered (if different):	 	Date: ________, 2021

 

	Investor’s EIN:	 	 
	 	 	 
	Business Address-Street:	 	Mailing Address-Street (if different):
	 	 	 
	City, State, Zip:	 	City, State, Zip:
	 	 	 
	Attn:	 	 	Attn:	 
	 	 	 
	Telephone No.:	 	Telephone No.:
	Facsimile No.:	 	Facsimile No.:
	 	 	 
	Number of Shares subscribed for:	 	 
	 	 	 
	Aggregate Subscription Amount: $	 	Price Per Share: $10.00

 

You must pay the Subscription
Amount by wire transfer of United States dollars in immediately available funds to the account specified by Lilium Holdco in the Closing
Notice.

 

[Signature Page to Subscription Agreement]

 

     

     

    

 

IN WITNESS WHEREOF,
Qell DutchCo B.V. and Qell Acquisition Corp have accepted this Subscription Agreement as of the date set forth below.

 

	 	QELL DUTCHCO B.V.
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:

 

	 	QELL ACQUISITION CORP
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:

 

Date:                         ,
2021

 

[Signature Page to Subscription Agreement]

 

     

     

    

 

SCHEDULE A

 

ELIGIBILITY REPRESENTATIONS OF THE INVESTOR

 

	A.	QUALIFIED INSTITUTIONAL BUYER STATUS

(Please check the applicable subparagraphs):

 

	 ̈	We are a “qualified institutional buyer” (as defined in Rule 144A under the Securities Act).

 

 **OR*

 

	B.	INSTITUTIONAL ACCREDITED INVESTOR STATUS

(Please check the applicable subparagraphs):

 

	1.	 ̈ We are an “accredited investor”
(within the meaning of Rule 501(a) under the Securities Act) or an entity in which all of the equity holders are accredited investors
within the meaning of Rule 501(a) under the Securities Act, and have marked and initialed the appropriate box on the following page
indicating the provision under which we qualify as an “accredited investor.”

 

	2.	 ̈ We are not a natural person.

 

Rule 501(a), in relevant part, states that
an “accredited investor” shall mean any person who comes within any of the below listed categories, or who the issuer reasonably
believes comes within any of the below listed categories, at the time of the sale of the securities to that person. The Investor has indicated,
by marking and initialing the appropriate box below, the provision(s) below which apply to the Investor and under which the Investor accordingly
qualifies as an “accredited investor.”

 

	 ̈	Any bank, registered broker or dealer, insurance company, registered investment company, business development
company, or small business investment company;

 

	 ̈	Any plan established and maintained by a state, its political subdivisions, or any agency or instrumentality
of a state or its political subdivisions for the benefit of its employees, if such plan has total assets in excess of $5,000,000;

 

	 ̈	Any employee benefit plan, within the meaning of the Employee Retirement Income Security Act of 1974,
if a bank, insurance company, or registered investment adviser makes the investment decisions, or if the plan has total assets in excess
of $5,000,000;

 

	 ̈	Any organization described in Section 501(c)(3) of the Internal Revenue Code, corporation, similar
business trust, or partnership, not formed for the specific purpose of acquiring the securities offered, with total assets in excess of
$5,000,000;

 

	 ̈	Any trust with assets in excess of $5,000,000, not formed to acquire the securities offered, whose purchase
is directed by a sophisticated person; or

 

	 ̈	Any entity in which all of the equity owners are accredited investors meeting one or more of the above
tests.

 

This page should be completed by the Investor
and constitutes a part of the Subscription Agreement.

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00325-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00325-of-00352.parquet"}]]