In 2019 Germans made more international tourism trips than americans, despite having only a quarter of the population.

But the observations depend on where you travel and see other travellers, right? Go to nw mexico and I expect most tourists are from the us? Whereas mallorca is practically the southernmost german bundesland? And cyprus presents plenty of russians?

And comparing geography: Germany is geographically much smaller than the US, and in a place like Liechtenstein it is easy to make an international trip just to go shopping, even if you take the bike.

Also factor in that many people who do fly, fly multiple times a year.

If that 93m is individual passengers then you should discount it quite a bit to accommodate frequent fliers and overseas tourists returning home.