United Airlines is making a change to its check-in time policy. United customers must check in for a domestic flight at least 45 minutes before a flight without any checked bags starting June 3. The prior policy required travelers to check in at least a half hour before a flight.

There will soon be another new travel rule that domestic flyers will have to keep in mind before heading to the airport. Starting on June 3, United Airlines will require all domestic passengers to check in for their flights at least 45 minutes before departure.