Alaska Airlines on Sunday, July 20 grounded all of its flights over a tech issue, but resumed its flights shortly after in the early hours of. However, the IT issue that caused the delays for travelers could end up causing more issues in the near future,

Alaska Airlines operates 238 Boeing aircraft, 87 Embraer planes, and 45 additional planes through Horizon Air. The Seattle-based company is the fifth-largest airline in the U.S., serving more than 44 million passengers annually.

U.S. carrier Alaska Airlines resumed operations late on Sunday after briefly grounding all of its flights for about three hours due to an IT outage, marking the second time it has halted its fleet in just over a year.