Member Spotlight Found in WWII US Air Force Photos The National Archives WWII US Air Force Photos Location: WWII US Air Force PhotosEuropeEnglandAircraftVapor TrailsThrough sub-zero...Page 1
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Vapor trails from Boeing B-17 Flying Fortresses (World War 2)

Sub-zero temperatures at high altitudes cause exhaust gases to condense leaving long vapor trails across the sky. These Eighth Air Force B-17s were flying towards communication targets from their base in England.

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