Higher than I would have thought! I was just thinking about this again and my SWAG was 5%. I asked ChatGPT which repeated the shockingly high 28% number, but it elides the fact that this was in a (small) survey of 2000 "travelers" (whatever that means-- but i suspect it means 2000 people who travelled in the past year):

> In the past year, the poll of 2,000 U.S. travelers, conducted by Talker Research, found 94% have traveled domestically, and 28% have traveled internationally.

source: https://www.myjournalcourier.com/features/article/unpacking-...