Jetsetwilly
Great nickname, in fact - I think it would be a great name for an airline. Has the fun and naughtiness associated with Virgin Atlantic when they set up.
Might be an urban myth, but I think Sir RB want to call Economy 'RiffRaff Class' to go along with 'Upper Class'.
Just think of all the marketing fun and one liners you could have with "Jetsetwilly"
And as is the current custom for naming your aircraft.....Jetsetwilly (the airline) would go for:-
Weewillywinky
Willy Wonka
Fat Willy
Willy Nilly