Southwest Airlines passengers scrambled to reschedule flights after hundreds were canceled because of technical glitches.

The airline announced that more than 450 flights have been canceled in attempt to get planes back in line.

The cancelations were primarily a result of displaced crews and aircraft.

“Simply put, if the Crews aren’t in place, the planes can’t fly,” employee Linda Rutherford stated on the airline’s website.

Flights across the country were held up as the airline scrambled to fix the problems.

For about three hours, passengers couldn’t buy tickets, check in for flights or check flight status on the company’s website.

Nearly 700 flights were canceled and hundreds more were delayed because of the technical glitch.

Southwest said passengers on its flights should check their flight status and plan to arrive earlier than usual because longer-than-usual lines are expected as several passengers who were impacted are rescheduled.

Southwest issued a statement to apologize for the inconvenience.