SEATTLE, Dec 27 (Reuters) – Skyrocketing COVID-19 cases hobbled U.S. airline staff on Monday, causing hundreds of flight cancellations, and prompted the country’s top infectious disease expert to suggest the government consider a vaccine mandate for domestic air travel.

Monday’s travel woes capped a glum Christmas weekend for thousands of stranded passengers waiting in airport queues and on customer service phone lines to re-book flights, often days after originally planned.

Like other businesses, airlines have struggled with staffing issues in recent days, as the spread of infections from the Omicron variant kept pilots, cabin crew and other workers who have fallen ill at home.

Bad weather has also taken a toll on travel. A total 1,208 flights into, within or out of the United States were canceled by Monday afternoon, according to the flight tracking website flightaware.com.

The average number of new COVID-19 cases in the United States has risen 55% to over 205,000 per day over the last seven days, according to a Reuters tally.

The U.S. Centers for Disease Control and Prevention (CDC) said on Monday it was shortening the recommended isolation time for Americans with COVID-19 to five days from its previous guidance of 10 days, so long as they are asymptomatic. The move could help airlines and other businesses mitigate staff shortages from the disease.

Dr. Anthony Fauci, the nation’s top U.S. infectious disease expert, on Monday also recommended the federal government consider a vaccine mandate for domestic air travel.

“That is just another one of the requirements that I think is reasonable to consider,” Fauci told MSNBC in an interview.

U.S. President Joe Biden, speaking to reporters on Monday, declined to say whether he endorsed a vaccine mandate for domestic air travel.

In another instance of Omicron-induced travel misery, the CDC said on Monday it was investigating 68 cruise ships after reports of COVID-19 cases on board.

SEVEN-HOUR HOLD TIME

On Monday, snowy weather in the Pacific Northwest was also part of the reason for more than 110 canceled flight arrivals at Seattle-Tacoma Airport.

A representative for Alaska Airlines, which canceled more than 140 flights on Monday due partly to snowy conditions in Seattle, told a passenger on Twitter that it would be hours before someone from customer service could speak by phone, signaling the extent to which airline phone lines were overwhelmed with frustrated passengers.

“The hold time is about 7 hours. I am so sorry,” Alaska Airlines wrote on Twitter in response to a customer complaint.

Aisling Daniel, an 18-year-old college student, was trying to return home to Anchorage, Alaska, with her younger sister and two black Labrador retrievers on Monday after visiting family in Kansas City. She was stuck in the Seattle-Tacoma International Airport and holding out hope that her newly booked flight out on Monday afternoon would not be canceled.

“The weather and the airport being understaffed is a really big problem here right now,” she said, the dogs wagging their tails behind her, their leashes tied to a railing.

Harley Garner, a 27-year-old creative strategist from Portland, and his brother from Seattle were staying with their parents in Pahrump, Nevada, over the holidays and had planned to fly home on Sunday evening. Both brothers’ respective flights -to Portland via Alaska Airlines and to Seattle via Allegiant Airlines – were canceled on Sunday afternoon. Both managed to book seats on later flights.

When their second flights were canceled, they decided to drive and got on the road shortly after 3 a.m. on Monday. Garner’s father was driving his sons to Bakersfield, California, where they planned to rent a car and then drive up to Portland and Seattle, totaling some 17 hours on the road.

Garner said the most frustrating part of the travel nightmare, which Alaska Airlines said was weather-related, although Portland was not experiencing severe weather on Monday, was the last-minute notification of cancellations.

“If you know a plane isn’t going to leave one place and that’s a connector flight, then just cancel that flight,” he said. “Don’t play these games like you don’t know that there’s a staff shortage because of the coronavirus.”

Reporting by Lindsey Wasson in Seattle, Washington, and Gabriella Borter in Fairfield, Connecticut; Additional reporting by Aishwarya Nair, Jonathan Allen, Aleksandra Michalska and Trevor Hunnicutt; Editing by Dan Grebler and Howard Goller

Our Standards: The Thomson Reuters Trust Principles.