On Tuesday, there were more than 1,000 flight cancelations for the fourth day in a row. The airlines cite winter weather and call-outs as the reasons.
Allegiant Air spokeswoman Hilarie Grey said that they anticipate more delays and cancelations this week.
At 3 p.m. The cancellation count in the U.S. had increased to 1,080.
Alaska Airlines, which had its operation disrupted by a snowstorm in Seattle over the weekend, is still the most affected carrier. On Tuesday, Alaska canceled 18% of its scheduled mainline flights, while regional subsidiary Horizon Air canceled 22% of its schedule.
The flight attendants' union is upset with loosened guidelines.
Alaska expects more difficulties in the coming days, with more bad weather and employees calling in sick due to Covid-19 infections.
The airline said that guests who don't have to travel before January 2 should consider rescheduling. We are unable to re-accommodate most guests for at least three days due to staffing issues and more snow.
SkyWest, which flies regional flights for Alaska as well as Delta, United and American, canceled 11% of its schedule on Tuesday.
The Big 3 carriers were not doing well. More than 250 of Delta's mainline and regional flights were canceled due to winter weather.
United canceled 93 mainline and regional flights Tuesday. The carrier had 132 cancellation within its mainline fleet Tuesday, according to FlightAware.
Dennis Tajer is a spokesman for the Allied Pilots Association, a union representing American pilots.
Over the holiday period, inadequate pilot staffing has played a role in American's cancellation.
He said that they were trying to fly a robust schedule because they were thinly staffed.
Southwest canceled 2% of its Tuesday schedule. Three flights were canceled by Frontier. Hawaiian had no cancellation.
