Exhibit 10.4

REGISTRATION RIGHTS AGREEMENT JOINDER

The undersigned is executing and delivering this joinder (this “Joinder”) pursuant to the Registration Rights Agreement, dated as of September 20, 2023 (as the same may hereafter be amended, the “Registration Rights Agreement”), among Wheels Up Experience Inc., a Delaware corporation (the “Company”), and the other persons or entities named as parties therein. Capitalized terms used but not otherwise defined herein shall have the meanings provided in the Registration Rights Agreement.

By executing and delivering this Joinder to the Company, and upon acceptance hereof by the Company upon the execution of a counterpart hereof, the undersigned hereby agrees to become a party to, to be bound by, and to comply with the Registration Rights Agreement as a Holder of Registrable Securities in the same manner as if the undersigned were an original signatory to the Registration Rights Agreement, and the undersigned’s shares of Common Stock shall be included as Registrable Securities under the Registration Rights Agreement to the extent provided therein.

Accordingly, the undersigned has executed and delivered this Joinder as of the __________ day of __________, 20__.

Signature of Stockholder

Print Name of Stockholder

Its:

Address:

Agreed and Accepted as of
____________, 20__

Wheels Up Experience Inc.

By:

Name:

Its: