Stragglers beware: U.S. travelers flying with United Airlines will have to check in to domestic flights a little earlier starting next week. That is, if they're customers only taking carry-on bags.

United Airlines has issued a warning to anyone looking to check-in or book flights online on Wednesday. United said it would be taking down key online and mobile services for about four and a half ...

Cutting it close is taking on a new meaning as United Airlines just changed a check-in policy that may make it harder for you to catch your next flight. The airline announced that starting June 3, ...