WASHINGTON—American Airlines Group Inc. and aircraft parts manufacturer Spirit AeroSystems Holdings Inc. said on Wednesday they would meet a deadline set by U.S. President Joe Biden to require vaccines for its employees by a Dec. 8 deadline for government contractors. The White House announced the Dec. 8 deadline for employees of federal contractors last month and the requirements are expected to cover millions of employees. American Airlines, the largest U.S. carrier, told its 100,000 U.S.-based employees they “must submit proof of full vaccination as soon as possible—no later than Wednesday, Nov. 24, 2021 … To be clear, if you fail to comply with the requirement, the result will be termination from the company.” Wichita, Kansas-based Spirit said the mandate would cover its 10,500 U.S. employees.”As a federal contractor, testing is not an option for Spirit employees,” the company said. Last month, Raytheon also said it would require all U.S. employees …