Exhibit 4.6



ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS#   . COMMON STOCK PAR VALUE $0.01 COMMON STOCK Certificate Number ZQ00000000   Shares * * 000000 * * * * * * * * * * * * * * * * * * * * * 000000 * * * * *   * * * * * * * * * * * * * * * * 000000 * * * * * * * * * * * * * * * * * * *   * * 000000 * * * * * * * * * * * * * * * * * * * * * 000000 * * * * * * * * *   * * * * * UNITED CONTINENTAL HOLDINGS, INC. INCORPORATED UNDER THE LAWS OF   THE STATE OF DELAWARE ** Mr. Alexander David Sample **** Mr. Alexander David   Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample ****   Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David SEE REVERSE FOR CERTAIN DEFINITIONS THIS CERTIFIES   THAT Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander Alexander David SamMple ***R* Mr. A.lexaSnderADavidMSampPle ***L*   MrE. Alexan&der DavMid SamRple **S** Mr.. AleSxandeAr DaMvid SamPple   *L*** MEr. Alex&ander David Sample **** David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander DavidMSampRle   ****.Mr. SAlexaAnderMDavidPSamLple *E*** Mr. &AlexandMer DavRid   SaSmple.**** SMr. AAlexanMder DaPvid SLampEle **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander   David Sample **** Mr. Alexander David Sample **** Mr. Sample **** Mr. Sample   is the owner of   **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares***   *000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****   000000**Shar*es****0*000Z00**SEhareRs****00O0000**ShHares**U**0000N00**SDhares*R***000E000**DShares**T**000H000**SOhares*U***000S000**AShareNs****00D0000**Shares****0   THIS CERTIFICATE IS TRANSFERABLE IN CITIES DESIGNATED BY THE TRANSFER AGENT,   AVAILABLE ONLINE AT www.computershare.com   00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00   0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000   000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000   00**Shares****0Z0000E0**ShRares***O*000000*H*ShareUs****0N00000D**SharRes****0E0000D0**ShareAs****0N00000D**SharesZ****00E0000R**SharOes****0*000*00**Shares****00000   0**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000   **Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*   *Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**   Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S   FULLY-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF United   Continental Holdings, Inc. transferable in person or by duly authorized   attorney upon surrender of this certificate properly endorsed. This   certificate and the shares represented hereby, are issued and shall be   subject to all of the provisions of the Amended and Restated Certificate of   Incorporation, as the same may be amended or restated from time to time   (copies of which are on file with the Transfer Agent), to all of which the   holder by acceptance of this certificate assents. This certificate is not   valid until countersigned by the Transfer Agent and registered by the   Registrar. Witness the signatures of its duly authorized officers. DATED   DD-MMM-YYYY COUNTERSIGNED AND REGISTERED: COMPUTERSHARE TRUST COMPANY, N.A.   TRANSFERAGENT ANDREGISTRAR, Chief Executive Officer By Secretary   AUTHORIZEDSIGNATURE CUSIP Holder ID Insurance Value Number of Shares DTC   Certificate Numbers 1234567890/1234567890 1234567890/1234567890   1234567890/1234567890 1234567890/1234567890 1234567890/1234567890   1234567890/1234567890 Total Transaction XXXXXX XX X XXXXXXXXXX 1,000,000.00   123456 12345678 123456789012345 PO BOX 43004, Providence, RI 02940-3004   Num/No. Denom. Total 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5 6 MR A SAMPLE   DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 CUSIP 910047 10 9 


    




 






 



. UNITED   CONTINENTAL HOLDINGS, INC. THE CORPORATION WILL FURNISH WITHOUT CHARGE TO   EACH STOCKHOLDER WHO SO REQUESTS, A SUMMARY OF THE POWERS, DESIGNATIONS,   PREFERENCES AND RELATIVE, PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF   EACH CLASS OF STOCK OR SERIES THEREOF OF THE CORPORATION AND THE   QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND/OR   RIGHTS. SUCH REQUEST MAY BE MADE TO THE OFFICE OF THE SECRETARY OF THE   COMPANY OR TO THE TRANSFER AGENT. (Cust) (Minor) (State) and not as tenants   in common (Cust) (Minor) (State) PLEASE INSERT SOCIAL SECURITY OR OTHER   IDENTIFYING NUMBER OF ASSIGNEE For value received, hereby sell, assign and   transfer unto (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL   ZIP CODE, OF ASSIGNEE) Shares of the common stock represented by the within   Certificate, and do hereby irrevocably constitute and appoint Attorney to   transfer the said stock on the books of the within-named Corporation with   full power of substitution in the premises. Dated: 20 Signature: Signature:   Notice: The signature to this assignment must correspond with the name as   written upon the face of the certificate, in every particular, without   alteration or enlargement, or any change whatever. The transfer of the shares   of United Continental Holdings, Inc. Common Stock represented by this   Certificate is subject to the restrictions pursuant to Article Fourth, Part   V, Sections 5,6 and 7 of the Amended and Restated Certificate of   Incorporation of United Continental Holdings, Inc., as the same may be   amended or restated from time to time. United Continental Holdings, Inc. will   furnish a copy of its Amended and Restated Certificate of Incorporation to   the holder of record of this Certificate without charge upon written request   addressed to United Continental Holdings, Inc. at its principal place of   business. The shares of United Continental Holdings, Inc. Common Stock   represented by this Certificate are subject to voting restrictions with   respect to shares held by persons or entities that fail to qualify as a   “citizen of the United States” as the term is defined in Section 40102(a)(15)   of Title 49 of the United States Code. Such voting restrictions are contained   in the Amended and Restated Certificate of Incorporation of United   Continental Holdings, Inc., as the same may be amended or restated from time   to time. A complete and correct copy of the Amended and Restated Certificate   of Incorporation shall be furnished free of charge to the holder of such   shares of United Continental Holdings, Inc. Common Stock upon written request   to the Secretary of United Continental Holdings, Inc. Signature(s)   Guaranteed: Medallion Guarantee Stamp THE SIGNATURE(S) SHOULD BE GUARANTEED   BY AN ELIGIBLE GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings and Loan   Associations and Credit Unions) WITH MEMBERSHIP IN AN APPROVED SIGNATURE   GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15. The following   abbreviations, when used in the inscription on the face of this certificate,   shall be construed as though they were written out in full according to   applicable laws or regulations: TEN COM - as tenants in common UNIF GIFT MIN   ACT - ............................................Custodian   ................................................ TEN ENT - as tenants by the   entireties under Uniform Gifts to Minors   Act......................................................... JT TEN - as   joint tenants with right of survivorship UNIF TRF MIN ACT -   ............................................Custodian (until age   ................................) .............................under Uniform   Transfers to Minors Act ................... Additional abbreviations may also   be used though not in the above list.