This is the second night in a row that a small, single-prop airplane has been flying slow circles over the northwest side of San Antonio (roughly between the Medical Center and Leon Valley). Last night, it went on for about 2 hours, until 2:00 AM. At around midnight this evening, I went out and watched it for a while, and noticed that it didn't have any lights turned on whatsoever.
This seemed pretty suspicious, so I called 311, who eventually got me in touch with a fellow out at the airport who promised to call the tower to find out what he could. He called back a few minutes later and said "Yes, the tower told me that there is an airplane flying over your part of the city, but it's at a legal altitude and is a government plane. That's all they would tell me."
AFAIK, our police department only uses helicopters, not planes. What the hell would someone be doing flying around in circles for several hours at a time, in the middle of the night, on several successive nights, without any lights on? Any guesses?