An expired passport can derail an international trip before boarding. Here is what travelers through four major U.S. gateways need to know about validity rules and exceptions.

High tides and powerful surf have damaged San Clemente’s coastal rail line again, sending crews into overnight emergency repairs as more high water approaches.

Joby Aviation and Travis Kalanick’s Atoms are teaming up to build vertiports across California, Florida, New York and Texas. The flying-car race is becoming a real-estate race.