Middle east Airlines used to use 'Cedarjet' do they still? The flight numbers 202 LHR-Beirut are unchanged from the 1960s when it was a B720.
BWIA were Bee Wee or West Indian
i also remember LHR ATC shortening some call signs as well Scandi and Lufty being the ones that stick in my mind.
Defunct because they are no longer around would include
TWA -Transworld
Seaboard and Western -Seaboard
Flying Tiger line-Tiger- very cool
National Airlines (National One being the daily LHR-MIA DC8 later 10 always with a pilot with a southern accent and the WW2 style girls name under the flight deck windows to fit in with their entirely non PC advertising)
Happy days back then with a great variety of aircraft types and unusual airlines operating funny schedules like Iraqi Airways Viscounts only on Sundays (about 6 stops from Baghdad) and Aerolinas Argentinas Comets who I think were also Sunday visitors.
Very different to the endless parade of A320 series and T7s which seem to take up about 75% of movements today