> Preclearance facilities exist because of agreements made between the U.S. federal government and the governments of the host countries. Travelers who have pas

> Preclearance facilities exist because of agreements made between the U.S. federal government and the governments of the host countries. Travelers who have passed through the U.S. government checks, but whose flight or ship has not departed, remain in the legal jurisdiction of the host country. https://en.wikipedia.org/wiki/United_States_border_preclearance https://en.wikipedia.org/wiki/United_States_border_precleara...