Most crowded airspace? I though O'Hare used to claim that, and these days Atlanta seems to brag. I used to like LaGuardia until Trump killed the Eastern Shuttle. It was the only airport I ever saw Airforce One at, and no it wasn't a 747 it was a VC-137C (707 variant). I flew out of National in Washington far more than LaGuardia but Airforce One flew out of Andrews and not National.
Interesting about Reagan's mass firing coming back to haunt them 30 years later when all the new kids reach retirement age.