For me it has to be:
Dan-Air (I was there 15 years)
Laker Airways (for the man himself!)
Spantax (the last operator of the speedy CV990 and others)
Braniff (for adding colour to the ramp - any ramp)
Courtline (for the same!)
and CP Air (for the same)
and Aviaction (for the same!!)
TAT (for the wonderful flight timetables they produced!)
Modern Air (another treat of Convairs!)
Delta Air Transport (for providing the big dougs and convair propliners late in their career)
Balair (for operating a beautiful DC-6, which took me to Basle and back)
SAM (for filling LGW with the sound of P&Ws every day!)
BAF (for the Carvair)
Futura (for many of my friends)
and many more....... RR