Very few parked cars too. I see the same phenomenon at London Gatwick Airport as well. Perhaps an internet sleuth can find out what time the image was captured

Very few parked cars too. I see the same phenomenon at London Gatwick Airport as well. Perhaps an internet sleuth can find out what time the image was captured (e.g. the control tower has a distinct shadow that can be measured) and see if it lines up with any specific event.