Frontier Airlines still recovering from Saturday's snowfall in Denver

Frontier Airlines planned to operate 75% of its schedule Tuesday as the carrier continues to have operational difficulties that resulted from a Saturday snowstorm.

"Again, we apologize to customers who have been impacted by this," airline spokesman Jim Faulkner said in a statement Monday night. "We continue to work around the clock."

The carrier has been inundated with complaints since the storm on Saturday, which dropped 9 inches of snow on its largest base, Denver International Airport. Over the weekend and through Monday, Frontier had received approximately 1,800 emails and on Monday alone reservation agents received approximately 16,000 calls, Faulkner said.

Criticism has also flowed on social media, where customers complained of lost baggage and long tarmac delays.

On Monday, the head of the Frontier chapter of the Air Line Pilots Association (ALPA) also commented, saying that it has been "outrageous" of Frontier to leave passengers, pilots and cabin crews stranded for hours without information.

"Frontier's private investors, led by William Franke and Indigo Partners, must decide whether they want to run a reliable airline or loot it," Brian Ketchum, head of ALPA's Frontier chapter, said in a statement. "If it's the former, they must invest in the infrastructure and frontline employees who are trying to succeed without corporate support."

Faulkner said that Frontier expected 60% of non-Denver bags to have been put on flights for their final destinations as of Monday evening. Delivery had also begun of local Denver bags, though no percentage was available.

Frontier, Faulkner said, is paying overtime to customer service and reservation staff as it works to resume normal operations.

Frontier wasn't the only carrier struggling to cope with Saturday's storm, which dumped more than twice as much snow on Denver as had been predicted.

On Sunday, regional carrier GoJet, which flies for United Express and Delta Connection, cancelled 39% of its flights out of Denver, according to FlightAware. That compared with Frontier's cancellation rate of 24%. But by Monday GoJet's cancellation rate was down to 6% at Denver while Frontier still cancelled 27% of flights.

Meanwhile, United didn't cancel any mainline operations out of Denver on Monday and canceled just 2% of mainline operations on Sunday. 

Faulkner said Frontier has been impacted more than other airlines in Denver because the airport is home to by far its largest operation. Some 650 of the carrier's pilots are based in Denver compared with 200 at its next-largest operations.

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