I liked Reagan National, within walking distance of anywhere I needed to go, and the NASA store always had cool stuff.
I flew out of the old Stapleton Airport in Denver once. That was a weird place. The runways were overpasses over I-70. You're driving along, and all of a sudden there's a big ol' airliner going right over you. Denver International is just big. Nothing really noteworthy except "Bluecifer", the demon horse sculpture who killed its designer.
Hartsfield, Atlanta, whatever they're calling it now, too many times to admit. BUT, here's some interesting trivia, that no one knows. In the '80s, Spirit of Atlanta Drum & Bugle Corps used to rehearse in an abandoned area of that airport. Painted a field in a parking area, and that's where we had our Everydays.
Somehow we were never caught, or told to leave or anything.
I remember LAX 1958. Ground level concourse. Go just about anywhere. DC-4, DC-6, Lockheed Constellations, Convair 340/440.