The main purpose of the Presidential Airlift Security Act of 2025 is to ensure that the aircraft used for presidential airlift in the United States are not procured or modified from foreign sources. This legislation aims to enhance national security by limiting reliance on foreign aircraft for transporting the President. The key provision of this law states that no funds allocated for the Department of Defense for the fiscal years 2025 and 2026 can be used to buy, modify, restore, or maintain any aircraft that has been owned by a foreign government or its representatives.