Here's the plot (http://www.tv.com/shows/the-naked-truth/up-up-and-away-19811/): The main characters are lost in a hot air balloon over the Pacific after trying to crash a wedding. The episode was told in flashback.

Apparently, this episode (https://en.wikipedia.org/wiki/List_of_The_Naked_Truth_episodes) was so soul-crushingly bleak (https://forums.lostmediawiki.com/thread/1177/truth-away) it was taken off the air at the last minute.