It is suprising-I knew UPS and Fedex have large fleets but didn`t realise it was so high.
Air freight does tend to get forgotton about especially in Northern Ireland, but the operation at Aldergrove is fairly extensive.
Operators include DHL,TNT,UPS,Royal Mail (handled by various operators-Jet2(Channex),Titan and various freight charters),Air Atlantique.