See also: Polish Air Force in Great Britain Following France's surrender in 1940, Polish units were formed in the United Kingdom, as a part of the Royal Air Force, and known as the Polish Air Force (PAF).
In the following years, further Polish squadrons were created: 304 (bomber, then Coastal Command), 305 (bomber), 306 (fighter), 307 (night fighter), 308 (fighter), 309 (reconnaissance, then fighter), 315 (fighter), 316 (fighter), 317 (fighter), 318 (fighter-reconnaissance) and No. 663 (air observation/artillery spotting).