Make check-in the smoothest part of your travel day.

The most common checked luggage size limit is 62 linear inches, but this varies among airlines. Size limits won't usually be ...

Starting early Wednesday, United customers won't be able to book flights and access other services as the airline upgrades its reservation system.

Checking in early can secure a better seat, help avoid being bumped, and give first dibs on last-minute upgrade deals. Delaying check-in risks losing your seat on full flights and reduces your chances ...