 The factors used in determining how an individual aerodrome is categorised by the GASAR study are based broadly on size and facilities . The six types of aerodrome are described , in size order , as : regional airports ( e.g. East Midlands ) ; major GA airports ( e.g. Oxford ) ; developed GA airfields ( e.g. <unk> ) ; basic GA airfields ( e.g. <unk> ) ; developed airstrips ( e.g. <unk> ) ; and basic airstrips ( e.g. <unk> in Hampshire ) . The actual criteria used to <unk> aerodromes were complex , using 28 different parameters , backed up with a peer review by experienced GA pilots . 
