Moving heavy aircraft such as the giant Lockheed C17 Globemasters and Tristar passenger jets calls for specialist vehicles . The RAF has purchased 32 Large Aircraft Tow Tractors (LATTs). http://www.mod.uk/DefenceInternet/DefenceNews/EquipmentAndLogistics/NewAircraftTractorsEnhanceRafCapability.htm I don't dispute the need to tow large aircraft, but surely 32 Tractors is more than the number of C17 and TRISTAR in the whole fleet! Even allowing for some tractors to be dotted around the world, 32 seems a little excessive!!