Alien Spaceship or Secret Government Test

A birdie friend sends this in:
Last night, around 2 am, there was this incredibly loud roar in the sky that woke me and my boyfriend up. I asked around this morning, and another friend who lives in C-Ville said the same thing. She and her boyfriend woke up to a really loud roar at 2am and were really confused. It sounded like a spaceship or a low-flying jet fighter plane, or something. Anyone know what it was?
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