Aliens are not impossible, just extremely unlikely for myriad reasons. More likely IMO is future/undiscovered humans (yes, something stupid like a secret inner earth society is more plausible than aliens) or even more likely is that a technological rival has surpassed the United States in aeronautical capability, or most likely that the US has top secret aeronautical capabilities decades beyond what they publicly display. Or holographic technology or something as was also suggested above.
Even if Aliens exist, which is almost definite given the scale of the universe, the same scale of the universe and time makes it seem nearly physically impossible to interact with any of them that may exist out there.
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