He was a pilot, born on 7th February 1910 and was previously with the squadron and was then posted back from 18 OTU, RAF Bramcote, on 28th July 1942. Aleksander Onoszko-Jacyna was a test pilot at the Experimental Aviation Workshops in Warsaw and later a pilot with Lot Polish Airlines. He left Poland in December 1939 and, like many others, he took a tortuous route to the west. He travelled via Czechoslovakia, Hungary, Jugoslavia, Italy and France before arriving in England where he joined the squadron.
He survived the war and emigrated to Toronto, Ontario, Canada where he died on 8th July 1994. He was cremated and his ashes were returned to Poland.