Backing up the AIH intials theory, it would seem that G-MLJL is for Mike Lee, chairman of the aviation division, and his wife, Juliet Lee.
This follows in other Airtours registrations where the 2nd and 4th letters are the same, implying a family surname . . . ie MDBD, MOJO (though I doubt that one is initials!), CSVS, LCRC etc, though I have no idea what each one stands for!
Hope this helps slightly,
SFly
