Back in the 80's, when Heck was a pup, Lambert was a TWA Hub. I was working for Union Electric and heavily involved in negotiating regulations that affected electric utilities nationwide. Flew to and from D.C. often. Once or twice nearly every week. Sometimes on short notice. Getting to D.C. wasn't usually a problem. Getting back home was a different story. TWA would schedule three to five sometimes six flights out of Reagan back to Lambert. And would just cancel flights willy nilly until they got a more or less full plane.... Buy a ticket for a 4:00 flight and finally get on one leaving at 8:30 happened all the time. That's what made me hate flying long before TSA was a thing.
I feel sorry for any business traveler today. At least back then you could still have a beer on a plane.