Adams explains to Ford that a terrorist named Prometheus stole a prototype device called the All-Seeing Eye, or ASE. He says Prometheus and his men have been tracked to Reagan National Airport so he's dispatching Ford there.
Upon arrival at the airport, Ford is attacked by Trust men, thinking Prometheus has turned the organizations own men against them. Fighting his way through the airport, Ford heads down to the Washington Metro subway terminal where Prometheus is believed to be making his escape. ("Contagion")
Reagan National Airport is in fact a real-world location. It's the main airport closest to Washington D.C.
- Official website: Reagan National Airport