For international travel the US doesn't have any say over who's flying to them from some other country. Though if you're a known terrorist or something be prepa

For international travel the US doesn't have any say over who's flying to them from some other country. Though if you're a known terrorist or something be prepared to be arrested once you land. And once they've landed you can be dragged off the plane, but if you're a US citizen then cannot deport you. They can take you to prison, but not to another country.