NEW YORK—Marriott and Hilton, two of the biggest U.S. hotel chains, told investors they expect people to resume packing their bags for business and leisure this year at rates not seen since before the pandemic. Hotel and other travel-related companies delivered rosy outlooks in this week’s quarterly results, citing rising vaccination rates and falling COVID-19 cases in the United States after the winter surge of the Omicron variant. Countries are also lifting travel restrictions, with Canada set to ease entry for fully vaccinated international travelers starting on Feb. 28. Marriott International Inc.’s and Airbnb Inc.’s latest quarterly results topped Wall Street estimates, while Hilton Worldwide Holdings Inc.’s revenue nearly doubled. On Tuesday, Marriott CEO Anthony Capuano told investors that group cancellations increased late last year and this year due to Omicron. Now, cancellations have slowed and new group bookings are gaining momentum. Capuano pointed to a Salesforce meeting in New …