Alaska Airlines has requested a ground stop for all its mainline aircraft, the US Federal Aviation Administration (FAA) status page said on Sunday.
The company also requested for ground stops of all Horizon Air Flights, the regional subsidiary operating Alaska Airlines flights.
The reason behind either of the requests was not immediately clear.
Alaska Airlines, Horizon Air and the FAA did not immediately respond to Reuters requests for comment outside regular business hours.
The FAA status page showed all destinations being impacted by the ground stop of Alaska’s mainline aircraft, and Horizon’s ground stop.
Alaska Air Group maintains an operational fleet of 238 Boeing 737 aircraft, and 87 Embraer 175 aircraft, according to its website.
In June, Alaska Air Group-owned Hawaiian Airlines said of its IT systems were disrupted by a hack. Alaska Air Group said it was still determining the financial impact of the hack.
