Exhibit 4.1

SECRETARY PRESIDENT COUNTERSIGNED AND REGISTERED: AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC (NEW YORK, NY) TRANSFER AGENT AND REGISTRAR BY: AUTHORIZED SIGNATURE THIS CERTIFIES THAT IS THE RECORD HOLDER OF FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, PAR VALUE $0.001 PER SHARE, OF WESCO AIRCRAFT HOLDINGS, INC. transferable on the books of the Corporation in person or by duly authorized attorney upon surrender of the Certificate properly endorsed. This Certificate is not valid unless countersigned by the Transfer Agent and registered by the Registrar. WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers. DATED Wesco Aircraft Holdings, Inc. CORPORATE SEAL DELAWARE 2006 WESCO AIRCRAFT HOLDINGS, INC. COMMON STOCK WESCO AIRCRAFT HOLDINGS, INC. INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE SEE REVERSE FOR CERTAIN DEFINITIONS CUSIP TO COME WA S H A R E S

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 TEN ENT JT TEN as tenants in common as tenants by the entireties as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT– Custodian (Cust) (Minor) under Uniform Gifts to Minors Act (State) Additional abbreviations may also be used though not in the above list. – – – of the Common Stock represented by the within Certificate, and do hereby irrevocably constitute and appoint to transfer the said shares of Common Stock on the books of the Company with full power of substitution in the premises. Dated For Value Received, hereby sell, assign and transfer unto PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE Shares Attorney 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. NOTICE: Signature(s) Guaranteed: 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. (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)   ABnote North America 711 ARMSTRONG LANE COLUMBIA, TENNESSEE 38401 (931) 388-3003 SALES; HOLLY GRONER 931-490-7660  PROOF OF: MAY 27, 2011 WESCO AIRCRAFT HOLDINGS, INC. WO 3750 BACK OERATOR: TS NEW  PLEASE THE APPROPRIATE SELECTION FOR THIS PROOF. OK AS IS OK WITH CHANGES MAKE CHANGES AND SEND ANOTHER PROOF