Originally Posted by bocastephen

Airports are not Federal property. The Federal government 'owns' the areas where it can conduct immigration, customs, and agricultural inspections, and it can 'own' certain airport items like the Control Tower, operating surfaces and navigation aids (either directly, or by regulatory control) - but the airport property and buildings, including the terminal space, are owned by the state, county or municipality or other operating organization which runs the airport.

Any local LEO or the TSA claiming the airport terminal is a 'federal building' is smoking something.