JetAir Flug GbmH is a subsidary company of Imperial Jet to my knowledge.
Imperial Jet operate from Beirut.
Imperial Jet appears to own 2 x Challenger 850's one of which is on the G reg and operated by Tag Farnborough and the other by a Austrian operator, Delivery position holder of another yet to be delivered 850, a 1982 Gulfstream III and Lease a Austrian reg Lear 60.