United Airlines CEO Scott Kirby noted that more relaxed office attendance policies are also letting people travel more.
The appetite for travel is persisting despite soaring airfares, which have been fueled by a pilot shortage and aircraft delivery delays.
Even after Labor Day, when travel normally slows down, "it's just not the case this year, especially for international travel," she said.
But if a recession hits, that could jeopardize all consumer spending — and prompt even higher-income Americans to rethink big trips.
Tim Quinlan, senior economist at Wells Fargo, expects the holiday season will be the "last hurrah" for consumers.