I saw this in theaters when it came out, it was already censored - it was to get the PG rating the studio wanted. The theatrical release was also PG. The only difference between theaters and DVD/Blu-ray was that everything from the convention to right before the big doors open up and Jason looks out into space was pillarboxed at 1.85:1, this effect was removed for all widescreen home releases in favor of a 2.35:1 ratio as soon as the TV show clip transitions into the convention.

I believe the movie was shot with the intent to go for PG-13 (some say R, I’m honestly not sure the version that was filmed went THAT far). Sounds like you saw a test screening before the edits were made, you are incredibly lucky. I’d assume that the only way the original dialogue would ever surface would be if someone found a copy of a workprint.

Airline versions generally are not less censored than theatrical, if anything they have extra censorship. A lot of the time, edits/overdubs in broadcast/basic cable versions show up on the airlines first. (For example, I know from a friend that “you mewling quim” was altered in the airline cut of The Avengers long before the movie hit basic cable…)