Not sure whether I'll be able to remember the whole collection (it was the mid 70s we're talking about), but these were definitely amongst them:
Airfix 1/144 scale
Air France B747
Air France Caravelle
Air France Concorde
BEA Comet 4c
BEA HS Trident 1C (?)
Braniff B747 (Big Orange - painted by hand!)
British Airways B707 (Negus livery)
British Airways B737-200 (Negus livery)
British Airways Concorde (Negus livery)
British Airways L1011 Tristar (Negus livery)
British United/BUA BAC 1-11
KLM DC9
Lufthansa A300B
Lufthansa B727
Lufthansa B737
Monarch B707 (again painted by hand)
Pan Am B727
SAS DC10
I also had a few Revell 1:144 kits and some from more obscure manufacturers.
I also recall having spent years trying to find the Airfix 1:144 scale BOAC or BA VC10 model, but never did find one...