The 'Airline' series was from 1989, if memory serves correctly.
The BOAC video was a two-part documentary released by Britsh Airways in the mid-nineties, and as was part of the Archive Collection. The second part of the video was a BA promotional film featuring the L1011 Tristar's introduction into BA service.
Sadly though, the film appears to have been made with suited marketing types in mind, and contains lots of eighties-type marketing babble and very litttle about the actual aircraft, which seems a shame now.
I have a copy of the BOAC video, which I bought in the gift shop at Cosford Air Museum of all places! Perhaps they'll let you buy it over the phone, if they still stock it.