Gordomac, can you remember the RT callsign(s) you used during your time on the LBA Viscounts ? It's a subject that's been discussed a few times on here. Possibles include:
BKS
Norjet
Norprop
Northeast
Albion
Bealine
Speedbird
I didn't have a proper airband receiver until the late 1980s so my knowledge is curtailed in this instance, although I have a faint recollection of a callsign (take your pick) plus the last two registration letters, e.g.
G-APEX = Albion Echo Xray.