The Civil Air Ensign, the British aeronautical national flag, flown by the aircraft (a Lockheed) that took Neville Chamberlain to Munich in 1938 for his meeting with Adolf Hitler. The Civil Air Ensign had been authorized for this purpose by King George V and his Privy Council in 1931. In surviving footage of the prime minister, this small flag can be seen flying from a short dorsal flagpole while the aeroplane is on the ground. (It can be seen indistinctly <a rel="nofollow" class="external text" href="https://www.agefotostock.com/age/en/details-photo/prime-minister-neville-chamberlain-at-heston-aerodrome-returning-from-the-munich-conference-30-september-1938-on-a-lockheed-super-electra-aircraft/MEV-12481354">here</a> as Chamberlain emerges from the plane at Heston Aerodrome.) It appears to have been lowered for flight. The dark blue cross appears off-centre, but this is not part of the typical design. Now in the Imperial War Museum, London (Museum No. [<a rel="nofollow" class="external free" href="https://www.iwm.org.uk/collections/item/object/30016861">https://www.iwm.org.uk/collections/item/object/30016861</a> FLA 970).
Air Ministry
<p>Imperial War Museum
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<a rel="nofollow" class="external free" href="https://www.iwm.org.uk/collections/item/object/30016861">https://www.iwm.org.uk/collections/item/object/30016861</a>