Album des Pavillons, edition 1995 [pie95], shows the Air Force flag and civil ensign as a blue flag with a white cross and the roundel set in the middle of the cross. This flag is no longer shown in the last release of Album des Pavillons[pay00] and might therefore be obsolete.
As for the civil air ensign, back in the 1950s all Olympic Airways aircrafts had it painted on the fuselage just behind and above the cockpit. The roundel on the flag soon disappeared from the aircrafts, leaving a plain Greek land flag. Later this flag was rerendered into a triangular form, which essentially remains the same today. Miles Li, 15 October 2001
The "Γενικό Επιτελείο Αεροπορίας, ΓΕΑ" (English: General Air Staff (GAS) was established in 1934.
The flag is a horizontal background featuring the roundel with a superimposed eagle and the motto, "Αίεν Υψικρατείν" (English: "Always dominate the heights") on top, inside a shield. The color horizontal stripes are a middle yellow stripe with two smaller bordering red stripes and overall a blue background, all horizontally laid and behind the CoA. Esteban Rivera, 10 March 2023 Source:https://www.haf.gr/structure/gea-2/
Roundel
Normal roundel
Low-visbility roundel
images by Željko Heimer, 13 October 2001
The Hellenic Air Force (Elliniki Polemiki Aeroporia) saw first action in the Balkan War (1912-1913). Cochran & Elliott [c2e98] report the Balkan war emblem as white-blue-white-blue-white stripes om wingtips and vertical blue-white-blue rudder stripes. After flying in First World War under French Army and British Navy, a new roundel appeared as blue ligh-blue, with darker shade for the Navy and a lighter shade for the Army, with corresponding rudderstripes. Forming an Air Force in 1930 by joining both air wings brought to the adoption of the army lighter shade as the Air Force colors. Cochran & Elliott report that during the 1960s the rudder stripes were changed to a fin flash. Dov Gutterman, 16 June 2004
Album des Pavillons[pay00] shows a blue-white-blue roundel and a greytone low visibility roundel. Željko Heimer, 13 October 2001