That's the P-38 rescued from the ice sheets in Greenland a few years back, and which now flies again. According to all dogma and ice core dating theory, Glacier Girl should have been under a foot or two of ice; it was actually found under about 270' of ice.
That makes Glacier Girl an element of the Amalekite Air Force since it makes her around 3500 years old and the Amalekites were the only people with that sort of tech savvy at that time. The basic reality is that all such dating schemes are a bunch of BS.