Archer Aviation (ACHR) SC 13G Archer Aviation / UNITED AIRLINES ownership change

Exhibit 99.1

Joint Filing Agreement

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, the undersigned agree to the joint filing of a Statement on Schedule 13G (including any and all amendments thereto) with respect to the common stock, par value $0.0001 per share, of Archer Aviation Inc., and further agree to the filing of this agreement as an Exhibit thereto. In addition, each party to this Agreement expressly authorizes each other party to this Agreement to file on its behalf any and all amendments to such Statement on Schedule 13G.

Date: September 27, 2021
	United Airlines Holdings, Inc.
	By:	/s/ Gerald Laderman
		Name: Gerald Laderman
		Title: Executive Vice President and Chief Financial Officer
	United Airlines, Inc.
	By:	/s/ Gerald Laderman
		Name: Gerald Laderman
		Title: Executive Vice President and Chief Financial Officer

United Airlines Ventures, Ltd.
By:	/s/ Michael Leskinen
	Name: Michael Leskinen
	Title: President