Best 747 flight- UA ORD-SFO Christmas Day 1980. Cabin crew outnumbered pax, and I took the 750 ml liquor bottles in the upper deck bar as a personal challenge.
Worst 747 flight- SABENA BRU-JFK in 1974. Waiting in BRU for the return to the US, announcements said about an hour delay when the equipment hadn't left JFK yet. When finally airborne, found out potable water hadn't been serviced, before we knew you shouldn't drink it.