Different fleets in the past for BA CC
BA have had some different fleets for their CC in the past. I have heard of Mid Fleet (757, 767 & 777) and Dual Fleet (747 & Tristar) at LHR. According to Wikipedia, the 767 joined the company in 1991 and the 777 four years later in 1995. BA also had DC10 and L-1011 until late 1990. Did all of the longhaul cabin crew either operate on Mid Fleet, Dual Fleet or some other combination of different aircraft types or solely one typical aircraft type?