...Note that the main upsurge in UFO sightings all began to occur after 1945.
This coincided with the invention of the..........................................................Jet engine...
and the.....A Bomb.
ummm...No.
Frank Whittle in the UK in the 1930's.
The Man Who Invented the Jet Engine
And the Germans used his patent to further develop the jet engine climaxing with the ME-262.
The time line coincidence of UFO sightings does correspond to the whole sale acquisition of German scientists after the war. During the war "Foo Fighter" sights were reported in surprising numbers. UFOs? By definition, yes. Alien space craft...?
TWO UFO`s FLY OVER FORT TICONDEROGA
``Tuesday the 11. Last night a very bright light appeared in the north and northwest part of the horizon [and] continued most of the night.`` Wednesday the 26. The weather continues very warm and pleasant. Last night in the evening we saw a star as we call them shoot in the air. The appearance was very bright and sparkling and the motion slow. Its course was from north to south about 2 minutes. After it was out of sight we heard a noise as loud as the report of a cannon. We supposed it to be a cannon fired at the head of the lake but upon inquiry there were no cannon fired at the head of the lake [George] or that way – therefore it is generally thought that it was the report of the star we saw.`
Wood, Lemuel, "Diaries Kept by Lemuel wood of Bedford", The Essex Institute Historical Collection 20, 1883