BA used Tristars on various transatlantic routes, to a range of points, although it varied from year to year. The Tristar fleet, like the 767 fleet which replaced it, was divided into two, European and Long-Haul, with quite different cabin layouts for each, but the majority was always Long-Haul.

The series 500s were a bit of a silly story. Delivered in about 1980, the whole lot were disposed to the RAF in 1983 during a downturn, almost immediately followed by BA getting new licences for South American routes for which they had to go out and lease secondhand 500s from Air Lanka from 1985 to 1988. However, East Coast services would typically be on the -200 fleet.

I flew a 500 from Heathrow to Seattle in 1982, and onwards to Vancouver BC. We just stayed on board at Seattle and didn't enter the USA. Would cause apoplexy nowadays.

We discussed the BA Tristar 500 flights that briefly operated London-New Orleans-Mexico City around post # 1570 above.