Factual error: In circling over Washington Dulles, a plane would fly over several airports that they could land at with perfect communication, including Richmond, Baltimore, Andrews AFB, etc. Also, there is no communication from the airport to the plane but the plane would be in range of no fewer than 15 transmitting stations that could have relayed messages.

Die Hard 2 (1990)
Plot summary
Directed by: Renny Harlin
Starring: Bruce Willis, William Sadler, Bonnie Bedelia, John Amos
On a snowy Christmas Eve in the nation's capitol, a team of terrorists has seized a major international airport, and now holds thousands of holiday travelers hostage. The terrorists, a renegade band of crack military commandos led by a murderous rogue officer, have come to rescue a drug lord from justice. They've prepared for every contingency, except for an off-duty cop seized by a feeling of deadly deja vu.
John McClane: Hey Carmine, let me ask you a question. When you go through the airport metal detector, what sets it off first? The lead in your ass or the shit in your brains?
Trivia: Producers of the movie were concerned that actual terrorists could use the information in the film to disrupt airport/airplane communications in real life. Most of the "sensitive" information in the film is not only wrong, it is purposely misleading to prevent terrorists from attempting what we see in the movie.
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Answer: In the first movie he's a New York cop visiting his wife. In the second Die Hard, he tells the airport officer that he's LAPD and moved there because of his wife's job. In the third Die Hard film, he most likely went back to New York because of marital problems and became a New York cop again.