Document:

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                                                                    Exhibit 10.4

                              PERFORMANCE GUARANTY

          This Performance Guaranty (this "Guaranty") is entered into as of
             , 2003 by DHL Holdings USA, Inc., a Delaware corporation
-------------
("Guarantor"), in favor of ABX Air, Inc., a Delaware corporation ("Airco").

                                    RECITALS

          WHEREAS, Airco and Airborne, Inc. , a Delaware corporation
("Groundco"), are concurrently entering into a Hub and Line-Haul Services
Agreement dated of even date herewith (the "Hub Services Agreement"), pursuant
to which Airco has agreed to provide certain hub, line-haul and maintenance
services to Groundco; and

          WHEREAS, Groundco is a wholly-owned subsidiary of Guarantor; and

          WHEREAS, as an inducement for Airco to enter into the Hub Services
Agreement, Guarantor desires to guarantee the Guarantied Obligations (as
hereinafter defined) of Groundco, as set forth below;

          NOW, THEREFORE, based upon the foregoing and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, and
in order to induce Airco to enter into the Hub Services Agreement, Guarantor
hereby agrees as follows:

          Section 1. Definitions. Except as otherwise provided herein, all
capitalized terms used in this Guaranty and not otherwise defined herein shall
have the respective meanings specified in the Hub Services Agreement, such
definitions to be equally applicable to the singular or plural forms of the
terms defined unless otherwise required by the context.

          Section 2. Guaranty. Guarantor, as primary obligor and not as surety,
hereby guarantees, without any setoff or other deduction, to Airco (i) the due,
punctual and full payment by Groundco of all payments of any and all sums to be
paid by Groundco pursuant to the Hub Services Agreement, whether such
obligations now exist or arise hereafter, when and as the same shall become due
and payable by Groundco in accordance with the terms thereof, and (ii) the due,
prompt and faithful performance and discharge by, and compliance with, all other
obligations, covenants, terms, conditions, undertakings and liabilities of,
Groundco under the Hub Services Agreement in accordance with the terms thereof
(all of the obligations, covenants, terms, conditions, undertakings and
liabilities described in this Section 2 are herein collectively referred to as
the "Guarantied Obligations").

          This Guaranty is continuing, absolute and unconditional and a guaranty
of payment, performance and compliance and not of collectibility, and is in no
way conditioned or contingent upon any attempt to collect from or enforce
performance or compliance by Groundco or the exercise or assertion of any other
right or remedy to which Airco is or may be entitled under or in connection with
the Hub Services Agreement. If for any reason whatsoever Groundco shall fail or
be unable duly, punctually and fully to pay such amounts as and when the same
shall become due and payable in accordance with their terms or to perform or
comply with any such obligation, covenant, term, condition or undertaking,
Guarantor will promptly pay or

<PAGE>

cause to be paid such amounts to the person or persons entitled to receive the
same under the terms of the Hub Services Agreement, or perform or comply with
any such obligation, covenant, term, condition or undertaking or cause the same
to be performed or complied with.

          Section 3. Character of Obligations of Guarantor. The obligations of
Guarantor set forth in this Guaranty shall remain in full force and effect until
payment and performance of the Guarantied Obligations in full, and shall not be
released, discharged or in any way affected by any of the following:

          (a) any amendment, modification, addition, deletion, supplement or
          renewal to or of or other change in the Guarantied Obligations or the
          Hub Services Agreement;

          (b) any failure, omission or delay on the part of Groundco to conform
          or comply with any term of the Hub Services Agreement;

          (c) any voluntary or involuntary bankruptcy, insolvency,
          reorganization, arrangement, readjustment, composition, liquidation,
          dissolution, winding up or similar proceeding with respect to
          Groundco; or

          (d) any merger or consolidation of Groundco or Guarantor into or with
          any other corporation, or any other corporate change in Groundco or
          Guarantor, or any sale, lease or transfer of any of the assets of
          Groundco or Guarantor to any other person, or any change in the
          ownership of any shares of capital stock of Groundco or Guarantor.

          Section 4. Waiver and Agreement. Guarantor waives any and all notice
of the creation, renewal, modification, extension or accrual of any of the
Guarantied Obligations and notice of or proof of reliance by Airco upon this
Guaranty or acceptance of this Guaranty, and the Guarantied Obligations, and any
of them, shall conclusively be deemed to have been created, contracted or
incurred in reliance upon this Guaranty. Guarantor unconditionally waives, to
the extent permitted by applicable law:

          (a) acceptance of this Guaranty and proof of reliance by Airco hereon;

          (b) notice of any of the matters referred to in Section 3 hereof, or
          any right to consent or assent to any thereof;

          (c) any right to the enforcement, assertion or exercise by Airco
          against Groundco of any right, power, privilege or remedy conferred
          upon Airco in the Hub Services Agreement or otherwise;

          (d) any requirement of diligence on the part of any person; and

          (e) any requirement that Groundco or any other person be joined as a
          party to any proceeding for the enforcement of any term of the Hub
          Services Agreement.

                                       2

<PAGE>

          Section 5. Subrogation. Guarantor shall be subrogated to any rights of
Airco against Groundco in respect of which a payment shall be made by Guarantor
hereunder; provided, however, that Guarantor shall not enforce or attempt to
enforce such rights until such time as the Guarantied Obligations at issue have
been discharged in full.

          Section 6. Airco's Remedies. Each and every remedy of Airco under or
with respect to this Guaranty shall, to the extent permitted by law, be
cumulative and shall be in addition to any other remedy given hereunder, or
under the Hub Services Agreement, or now or hereafter existing at law or in
equity; provided, however, that Airco shall not be entitled to any double
recovery.

          Section 7. Representations and Warranties. Guarantor hereby represents
and warrants to Airco that the following statements are true and correct:

          7.1. Guarantor is a corporation duly organized, validly existing and
in good standing under the laws of the State of Delaware.

          7.2. Guarantor has the corporate power and authority to enter into
this Guaranty. The making, execution and performance of this Guaranty by
Guarantor has been duly authorized by all necessary corporate action, this
Guaranty has been duly executed and delivered by Guarantor and this Guaranty
constitutes the valid and binding obligation of Guarantor, enforceable in
accordance with its terms, except as may be limited by bankruptcy, insolvency,
reorganization, moratorium or similar laws relating to creditors rights
generally, including, without limitation, fraudulent conveyance laws, and by
general principles of equity, including, without limitation, concepts of
materiality, reasonableness, good faith and fair dealing and the possible
unavailability of specific performance or injunctive relief, whether considered
in a proceeding in equity or at law

          7.3. The execution, delivery and performance of this Guaranty (a) will
not violate any provision of any existing law or regulation binding on
Guarantor, or any order, judgment, award or decree of any court, arbitrator or
governmental authority binding on Guarantor, or the charter or bylaws of, or any
securities issued by Guarantor, or of any mortgage, indenture, lease, contract
or other agreement, instrument or undertaking to which Guarantor is a party or
by which Guarantor or any of its assets may be bound, the violation of which
would have a material adverse effect on the business, operations, assets or
financial condition of Guarantor, and (b) will not result in the creation or
imposition of any encumbrance on any of Guarantor's property, assets or revenues
pursuant to the provisions of any such mortgage, indenture, lease, contract or
other agreement, instrument or undertaking. No consent, license, approval, order
or authorization of, or registration, filing, or declaration with, any
governmental authority is required to be obtained by Guarantor, and no consent
of any third party is required to be obtained by Guarantor, in connection with
the execution, delivery and performance of this Guaranty or the taking of the
actions contemplated hereby. There is no order or action pending or, to the best
knowledge of Guarantor, threatened against Guarantor that individually or when
aggregated with one or more other actions has or might reasonably be expected to
have a material adverse effect on Guarantor's ability to perform this Guaranty.

                                       3

<PAGE>

          7.4. Upon consummation of the merger of Atlantis Acquisition
Corporation, a wholly owned subsidiary of Guarantor, and Groundco, Guarantor
will be the owner of all of the issued and outstanding capital stock of
Groundco. Guarantor is the record and beneficial owner of all outstanding voting
securities of DHL Worldwide Express, Inc. ("DHL Groundco").

          Section 8. Term of Agreement. This Guaranty and all guaranties,
covenants and agreements of Guarantor contained herein shall continue in full
force and effect and shall not be discharged until such time as all the
Guarantied Obligations shall be paid in full and all the agreements of Groundco
and Guarantor hereunder and under the Hub Services Agreement shall have been
duly performed. This Guaranty shall terminate and be of no further force or
effect in the event of (i) final and irrevocable payment or performance of the
Guarantied Obligations, and (ii) payment of the expenses that Guarantor is
obligated to pay pursuant to Section 9 below.

          Section 9. Expenses. Guarantor shall pay to Airco on demand each cost
and expense (including, without limitation, attorney's fees) hereafter incurred
by Airco in endeavoring to enforce any obligation of Guarantor pursuant to this
Guaranty or preserve or exercise any right or remedy against Guarantor pursuant
to this Guaranty or arising as a result of this Guaranty; provided, however, in
connection with any legal action Airco shall not be entitled to such costs or
expenses if Airco does not prevail.

          Section 10. Amendments. The terms of this Guaranty may not be waived,
altered, modified, amended, supplemented or terminated in any manner whatsoever
except by written instrument signed by Guarantor and Airco.

          Section 11. Applicable Law. This Guaranty shall be governed by, and
construed and enforced in accordance with, the laws of the State of New York,
without regard to principles of conflicts of laws.

          Section 12. Section Headings. The section headings are inserted for
convenience only and are not to be construed as part of this Guaranty.

          Section 13. Notices. All notices and other communications to be made
or given pursuant to this Guaranty shall be made or given in the manner provided
in Subsection 14.5 of the Hub Services Agreement, and if to Guarantor, to the
following location:

               DHL  Holdings USA Inc.

               -----------------------------------

               -----------------------------------

               Attention:
                          ------------------------

          Section 14. Assignment. Guarantor may not assign this Guaranty, and
its rights and obligations hereunder, without the prior written consent of
Airco, which consent shall not be unreasonably withheld.

          Section 15. Successor. This Guarantee is binding upon any successor to
Guarantor. Guarantor shall not sell or otherwise transfer a majority of
operations, assets or voting securities of Groundco or DHL Groundco, unless such
transferee agrees to act as a guarantor hereunder, in addition to Guarantor.

                                       4

<PAGE>

          Section 15. No Other Writing. This writing is intended by the parties
as the final expression of this Guaranty and is also intended as a complete and
exclusive statement of the terms of their agreement with respect thereto.

                                       5

<PAGE>

          IN WITNESS WHEREOF, Guarantor has executed this Guaranty by its duly
authorized officer as of the date first above written.

                                              DHL HOLDINGS USA INC.

                                              By:
                                                  ------------------------------
                                              Its:
                                                   -----------------------------

ACCEPTED AND AGREED:

ABX AIR, INC.

By:
    -------------------------------
Its:
     ------------------------------<PAGE>

                                                                    Exhibit 10.5

                              PERFORMANCE GUARANTY

          This Performance Guaranty (this "Guaranty") is entered into as of
             , 2003 by DHL Holdings USA, Inc., a Delaware corporation
-------------
("Guarantor"), in favor of ABX Air, Inc., a Delaware corporation ("Airco").

                                    RECITALS

          WHEREAS, Airco and Airborne, Inc. , a Delaware corporation
("Groundco"), are concurrently entering into an ACMI Service Agreement dated of
even date herewith (the "ACMI Agreement"), pursuant to which Airco has agreed to
provide certain air transportation services to Groundco; and

          WHEREAS, Groundco is a wholly-owned subsidiary of Guarantor; and

          WHEREAS, as an inducement for Airco to enter into the ACMI Agreement,
Guarantor desires to guarantee the Guarantied Obligations (as hereinafter
defined) of Groundco, as set forth below;

          NOW, THEREFORE, based upon the foregoing and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, and
in order to induce Airco to enter into the ACMI Agreement, Guarantor hereby
agrees as follows:

          Section 1. Definitions. Except as otherwise provided herein, all
capitalized terms used in this Guaranty and not otherwise defined herein shall
have the respective meanings specified in the ACMI Agreement, such definitions
to be equally applicable to the singular or plural forms of the terms defined
unless otherwise required by the context.

          Section 2. Guaranty. Guarantor, as primary obligor and not as surety,
hereby guarantees, without any setoff or other deduction, to Airco (i) the due,
punctual and full payment by Groundco of all payments of any and all sums to be
paid by Groundco pursuant to the ACMI Agreement, whether such obligations now
exist or arise hereafter, when and as the same shall become due and payable by
Groundco in accordance with the terms thereof, and (ii) the due, prompt and
faithful performance and discharge by, and compliance with, all other
obligations, covenants, terms, conditions, undertakings and liabilities of,
Groundco under the ACMI Agreement in accordance with the terms thereof (all of
the obligations, covenants, terms, conditions, undertakings and liabilities
described in this Section 2 are herein collectively referred to as the
"Guarantied Obligations").

          This Guaranty is continuing, absolute and unconditional and a guaranty
of payment, performance and compliance and not of collectibility, and is in no
way conditioned or contingent upon any attempt to collect from or enforce
performance or compliance by Groundco or the exercise or assertion of any other
right or remedy to which Airco is or may be entitled under or in connection with
the ACMI Agreement. If for any reason whatsoever Groundco shall fail or be
unable duly, punctually and fully to pay such amounts as and when the same shall
become due and payable in accordance with their terms or to perform or comply
with any such obligation, covenant, term, condition or undertaking, Guarantor
will promptly pay or cause to be

<PAGE>

paid such amounts to the person or persons entitled to receive the same under
the terms of the ACMI Agreement, or perform or comply with any such obligation,
covenant, term, condition or undertaking or cause the same to be performed or
complied with.

          Section 3. Character of Obligations of Guarantor. The obligations of
Guarantor set forth in this Guaranty shall remain in full force and effect until
payment and performance of the Guarantied Obligations in full, and shall not be
released, discharged or in any way affected by any of the following:

          (a) any amendment, modification, addition, deletion, supplement or
          renewal to or of or other change in the Guarantied Obligations or the
          ACMI Agreement;

          (b) any failure, omission or delay on the part of Groundco to conform
          or comply with any term of the ACMI Agreement;

          (c) any voluntary or involuntary bankruptcy, insolvency,
          reorganization, arrangement, readjustment, composition, liquidation,
          dissolution, winding up or similar proceeding with respect to
          Groundco; or

          (d) any merger or consolidation of Groundco or Guarantor into or with
          any other corporation, or any other corporate change in Groundco or
          Guarantor, or any sale, lease or transfer of any of the assets of
          Groundco or Guarantor to any other person, or any change in the
          ownership of any shares of capital stock of Groundco or Guarantor.

          Section 4. Waiver and Agreement. Guarantor waives any and all notice
of the creation, renewal, modification, extension or accrual of any of the
Guarantied Obligations and notice of or proof of reliance by Airco upon this
Guaranty or acceptance of this Guaranty, and the Guarantied Obligations, and any
of them, shall conclusively be deemed to have been created, contracted or
incurred in reliance upon this Guaranty. Guarantor unconditionally waives, to
the extent permitted by applicable law:

          (a) acceptance of this Guaranty and proof of reliance by Airco hereon;

          (b) notice of any of the matters referred to in Section 3 hereof, or
          any right to consent or assent to any thereof;

          (c) any right to the enforcement, assertion or exercise by Airco
          against Groundco of any right, power, privilege or remedy conferred
          upon Airco in the ACMI Agreement or otherwise;

          (d) any requirement of diligence on the part of any person; and

          (e) any requirement that Groundco or any other person be joined as a
          party to any proceeding for the enforcement of any term of the ACMI
          Agreement.

          Section 5. Subrogation. Guarantor shall be subrogated to any rights of
Airco against Groundco in respect of which a payment shall be made by Guarantor
hereunder;

                                       2

<PAGE>

provided, however, that Guarantor shall not enforce or attempt to enforce such
rights until such time as the Guarantied Obligations at issue have been
discharged in full.

          Section 6. Airco's Remedies. Each and every remedy of Airco under or
with respect to this Guaranty shall, to the extent permitted by law, be
cumulative and shall be in addition to any other remedy given hereunder, or
under the ACMI Agreement, or now or hereafter existing at law or in equity;
provided, however, that Airco shall not be entitled to any double recovery.

          Section 7. Representations and Warranties. Guarantor hereby represents
and warrants to Airco that the following statements are true and correct:

          7.1. Guarantor is a corporation duly organized, validly existing and
in good standing under the laws of the State of Delaware.

          7.2. Guarantor has the corporate power and authority to enter into
this Guaranty. The making, execution and performance of this Guaranty by
Guarantor has been duly authorized by all necessary corporate action, this
Guaranty has been duly executed and delivered by Guarantor and this Guaranty
constitutes the valid and binding obligation of Guarantor, enforceable in
accordance with its terms, except as may be limited by bankruptcy, insolvency,
reorganization, moratorium or similar laws relating to creditors rights
generally, including, without limitation, fraudulent conveyance laws, and by
general principles of equity, including, without limitation, concepts of
materiality, reasonableness, good faith and fair dealing and the possible
unavailability of specific performance or injunctive relief, whether considered
in a proceeding in equity or at law

          7.3. The execution, delivery and performance of this Guaranty (a) will
not violate any provision of any existing law or regulation binding on
Guarantor, or any order, judgment, award or decree of any court, arbitrator or
governmental authority binding on Guarantor, or the charter or bylaws of, or any
securities issued by Guarantor, or of any mortgage, indenture, lease, contract
or other agreement, instrument or undertaking to which Guarantor is a party or
by which Guarantor or any of its assets may be bound, the violation of which
would have a material adverse effect on the business, operations, assets or
financial condition of Guarantor, and (b) will not result in the creation or
imposition of any encumbrance on any of Guarantor's property, assets or revenues
pursuant to the provisions of any such mortgage, indenture, lease, contract or
other agreement, instrument or undertaking. No consent, license, approval, order
or authorization of, or registration, filing, or declaration with, any
governmental authority is required to be obtained by Guarantor, and no consent
of any third party is required to be obtained by Guarantor, in connection with
the execution, delivery and performance of this Guaranty or the taking of the
actions contemplated hereby. There is no order or action pending or, to the best
knowledge of Guarantor, threatened against Guarantor that individually or when
aggregated with one or more other actions has or might reasonably be expected to
have a material adverse effect on Guarantor's ability to perform this Guaranty.

          7.4. Upon consummation of the merger of Atlantis Acquisition
Corporation, a wholly owned subsidiary of Guarantor, and Groundco, Guarantor
will be the owner of all of the

                                       3

<PAGE>

issued and outstanding capital stock of Groundco. Guarantor is the record and
beneficial owner of all outstanding voting securities of DHL Worldwide Express,
Inc. ("DHL Groundco").

          Section 8. Term of Agreement. This Guaranty and all guaranties,
covenants and agreements of Guarantor contained herein shall continue in full
force and effect and shall not be discharged until such time as all the
Guarantied Obligations shall be paid in full and all the agreements of Groundco
and Guarantor hereunder and under the ACMI Agreement shall have been duly
performed. This Guaranty shall terminate and be of no further force or effect in
the event of (i) final and irrevocable payment or performance of the Guarantied
Obligations, and (ii) payment of the expenses that Guarantor is obligated to pay
pursuant to Section 9 below.

          Section 9. Expenses. Guarantor shall pay to Airco on demand each cost
and expense (including, without limitation, attorney's fees) hereafter incurred
by Airco in endeavoring to enforce any obligation of Guarantor pursuant to this
Guaranty or preserve or exercise any right or remedy against Guarantor pursuant
to this Guaranty or arising as a result of this Guaranty; provided, however, in
connection with any legal action Airco shall not be entitled to such costs or
expenses if Airco does not prevail.

          Section 10. Amendments. The terms of this Guaranty may not be waived,
altered, modified, amended, supplemented or terminated in any manner whatsoever
except by written instrument signed by Guarantor and Airco.

          Section 11. Applicable Law. This Guaranty shall be governed by, and
construed and enforced in accordance with, the laws of the State of New York,
without regard to principles of conflicts of laws.

          Section 12. Section Headings. The section headings are inserted for
convenience only and are not to be construed as part of this Guaranty.

          Section 13. Notices. All notices and other communications to be made
or given pursuant to this Guaranty shall be made or given in the manner provided
in Subsection 14.5 of the ACMI Agreement, and if to Guarantor, to the following
location:

               DHL Holdings USA Inc.

               -------------------------------------

               -------------------------------------

               Attention:
                          --------------------------

          Section 14. Assignment. Guarantor may not assign this Guaranty, and
its rights and obligations hereunder, without the prior written consent of
Airco, which consent shall not be unreasonably withheld.

          Section 15. Successor. This Guarantee is binding upon any successor to
Guarantor. Guarantor shall not sell or otherwise transfer a majority of
operations, assets or voting securities of Groundco or DHL Groundco, unless such
transferee agrees to act as a guarantor hereunder, in addition to Guarantor.

                                       4

<PAGE>

          Section 15. No Other Writing. This writing is intended by the parties
as the final expression of this Guaranty and is also intended as a complete and
exclusive statement of the terms of their agreement with respect thereto.

                                       5

<PAGE>

          IN WITNESS WHEREOF, Guarantor has executed this Guaranty by its duly
authorized officer as of the date first above written.

                                        DHL  HOLDINGS USA INC.

                                        By:
                                            -------------------------------
                                        Its:
                                            -------------------------------

ACCEPTED AND AGREED:

ABX AIR, INC.

By:
    -------------------------------
Its:
     ------------------------------

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