Naah. I am willing to accept a lot for the sake of discussion, but I can't see how this isn't all bollocks.
I am supposed to believe an alien race advanced enough to cross interstellar space isn't smart enough to remain undetected from the planets puny detection capabilities and in a desperate attempt to remain so, occasionally buzzes the odd airplane? I just don't see it, unless they are "teasers".
For those that don't understand the reference:
"Teasers are usually rich kids with nothing to do. They cruise around looking for planets that haven’t made interstellar contact yet and buzz them.” “Buzz them?” Arthur began to feel that Ford was enjoying making life difficult for him. “Yeah,” said Ford, “they buzz them. They find some isolated spot with very few people around, then land right by some poor unsuspecting soul whom no one’s ever going to believe and then strut up and down in front of him wearing silly antennas on their head and making beep beep noises."
