Georgios Pleionis was born in Kymi on the island of Euboea in 1920.[1] He entered the Hellenic Air Force Academy in 1939,[1] after being rejected the previous year due to low body weight.[2]
After a stay in Gaza, where the Greek officers fleeing from occupied Greece were being gathered, on 4 October 1942 Pleionis joined the Hurricane-equipped and Greek-crewed No. 335 Squadron under RAF control in North Africa.[2] He participated in the operations over the Western Desert as well as convoy escort missions in the Mediterranean, and air operations in Italy and the Dalmatian coast.[1] He returned to liberated Greece on 14 November 1944, and continued flying missions against the German garrisons left behind in Crete and other Aegean islands.[1]
During this career, Pleionis flew in total 383 combat missions, and received numerous Greek and foreign decorations, including the Cross of Valour.[1]
Pleionis refused to cooperate with the Greek junta installed in April 1967, and was retired from service on 12 May 1967 with the rank of brigadier. Following the fall of the junta in 1974, he was retroactively promoted to the rank of air vice marshal.[1] He died on 19 April 2021 at the age of 101, as the last World War II-era pilot of 335 Squadron.[1]