The TSA (and it's extensive bureaucracy) didn't exist,
DHS (and it's extensive bureaucracy) didn't exist,
The idea that the U.S. government/military would actually shoot you down would have been thought to be not possible (unless illegally flying across actual national borders).,
You could leave your shoes on as you passed through the metal detectors at the airport,
You could enter the National Park exhibit area below "The Arch" in St. Louis without passing through a metal detector,
You could go to the various Smithsonian Institution buildings in D.C. without going through metal detectors,
You could actually fly an aircraft to any/or all the airports in the D.C. Metro area,
Our "Brave" politicians in D.C. didn't run for cover if/when a citizen flew near the D.C. metro area in a C152,
You could jump into a plane with little more than a glance at the sky and not fear encroaching on a politically motivated TFR and risk military intervention, or attack,
You could board an aircraft without removing your belt, unbuttoning your pants, etc., so "security" can check you out,
Your luggage wasn't regularly rifled through by "security" at the airport,
You could go to a 'ball game without going through metal detectors/"security screening",
If you happened to be in FL, you could fly over Disney World just to see what it looked like from the air,
If you wanted to come to Chicago, you could land right next to the downtown area,
The primary purpose of a weather briefing was to determine if there was any WEATHER out there that may very well kill you, now the primary purpose is to determine if there is a TFR where the government may very well kill you,
When you wanted to fly on an airliner, you were considered an innocent, law abiding, citizen, now you are considered a terrorist threat until such time as you prove you are not through search of you and all possessions, and surrender of ANYTHING they want to name as potential contraban,
You could accompany a friend/relative to the airport/airline gate area to see them off,
You could wait in the drive through area of the airport for your friend/relative upon their return from the trip,
You could wait in the airline gate area for your friend/relative upon their return flight from their trip,
A few more legacy airlines MAY have still been in business,
A few less airlines MAY have not entered bankurptcy,
I'm sure I could continue this list, but I'm tired of thinking right now..