This was a thread in 2005 asking PPRuNers to state which airlines were handled by which handling agents.
http://www.pprune.org/forums/showthread.php?t=134015
As the industry is always changing, I thought it'd be a good idea to revisit this idea by launching a new thread for 2007. I'll get the ball rolling by using EMA as an example
Penauille-Servisair
Thomsonfly, MyTravel Airways, First Choice Airways, EasyJet, Ryanair, Air Malta, Spanair, Air Europa, BritishJet, GB Airways, Austrian Arrows, Monarch Airlines, LTE.
Menzies Aviation
Thomas Cook Airlines, Eastern Airways, bmibaby (currently only ramp with bmibaby having their own front of house and dispatch staff) and bmi regional (again currently only ramp with bmibaby handling front of house and dispatch)