Can anyone explain why the number of US passengers increased in a proportion at the same time? Perhaps airlines dropped prices due to the lower demand, causing US citizens to snap up tickets?
It happens every year, but not necessarily on the same dates, both year to year and family to family, depending largely on where you or your kids go to school. Most people I know had spring break Mar 17-23 this year. It was a few weeks earlier last year.
I see. According to this [0] website spring break finished typically in mid-March last year. Perhaps that explains why the blue line in OP dips back to 0% around mid-March.
maybe Americans semi-permanently abroad assume other countries will employ reciprocal craziness, like a trade war, and are running home before they get locked up too?
Maybe US business people are traveling to other countries to compensate for the resistance or refusal of international partners to travel to a fascist state.
People coming home for fear of retaliation? People coming home to help family who might get caught in some detention issue? People who were working for agencies like USAID no longer having a reason to be abroad?