aircraft construction helicopters 130 military aircrafts 70 air force 66 air transport 41 history 32 military operations 7 more ... innovation 5 characteristic 4 navy 4 aerodynamics of airplanes 2 renewal 2 repairs 2 propulsion system 2 velocity 2 shaft turbine engines 2 military transport 2 flight control 2 army 1 aircrafts 1 fixed-wing aeroplanes 1 flight tests 1 peace-making operations 1 osobnosti 1 police 1 first aid 1 investigation services 1 rebuildings 1 permanent establishments 1 military training 1 less ...