What requirement must a non-US citizen complete to begin flight training in the United States?

In order for a non-U.S. citizen to begin flight training in the United States, they must obtain clearance by the Secretary of Homeland Security. This requirement is in place to ensure that the individual meets specific regulatory standards and security protocols set forth by the U.S. government. The process involves checking the individual's background and determining the eligibility for recreational or professional flight training, which is essential for maintaining the integrity and security of aviation operations.

While there are other important steps to take prior to engaging in flight training, such as obtaining a student pilot certificate or passing a knowledge test, these processes typically follow the initial clearance requirement. The necessity of a valid passport is also crucial for identification purposes and legal entry into the U.S., but it does not suffice on its own without the clearance from the Secretary of Homeland Security for flight training specifically.