I was stopped at a gas station outside Edwards AFB when SpaceShipOne was making its first trip into space. I was moving from NORCAL to Arkansas and I stopped for gas. While filling up I heard a sonic boom. I was looking around at the other people at the station and they didn't seem to notice. I wasn't sure what had cause it, but I mentally marked the time and a few weeks later I saw an aviation magazine touting the date and time it had happened. It was accidental but also fortuitous to have been there at that time and not sitting in the car with the radio going.
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