When the US adopted a Swiss war plane's twin - SWI swissinfo.ch
Pilatus PC-9 - Aircraft Recognition Guide
PILATUS PC-9 Beech | SKYbrary Aviation Safety
RAAF retires the Pilatus PC-9/A – AviationWA
Slovenian Air Force and Air Defence Pilatus PC-9M Hudournik plane at the Royal International Air Tattoo, RIAT, RAF Fairford. PC-9 airplane Stock Photo - Alamy