My favorite UA memory actually occured in San Diego around 1995. UA was celebrating 50 years of service to SAN and actually arranged to take a delivery flight of a new 777 from Boeing to San Diego to mark the occasion. My neighbor, the US station manager at the time (former PSA employee) offered to let me tag along with her to go to the airport employee tour of the new 777.
Obviously, there were lots of SAN employees and UA officials there and we were allowed to walk around the plane and then climb up for a flight deck tour. I was lucky enough to take the left seat for a while and the volunteer UA crew members gave me a demonstration of the systems. The thing I remember most is the ease of use of the "point and click" nav system that would enable the crew to command the aircraft to any possible diversion station if necessary.
Seeing the new 777 sitting in SAN made the airport look small. It was a great way to spend the afternoon during those "good times" at UA.