Travelers are calling off holiday trips as Covid-19 case counts surge around the country, threatening U.S. airlines’ last hopes for bringing in more revenue this year.
United Airlines Holdings Inc. became the latest carrier on Thursday to report that bookings have slowed and cancellations have risen over the last week amid a nationwide surge in Covid-19 cases. Southwest Airlines Co. said last week that new bookings have slowed and has said cancellations have picked up. Alaska Air Group Inc. said Thursday that renewed state…