Passenger traffic at U.S. airports remains far below normal, but growing vaccination rates and an improving economy are leading to pent-up demand for travel, experts say.
Where it stands: A year into the pandemic, domestic air travel is 55% below pre-pandemic levels, while international travel is down 71%.
Delta Air Lines is the only U.S. carrier still blocking middle seats as a way to limit capacity (through April).
What to watch: Surveys show there's a growing willingness to travel once the virus is contained, according to the International Air Transport Association.
But government quarantines are "a showstopper," says the group's CEO, Alexandre de Juniac.
Global airlines are pushing for countries to enact a standardized digital health pass that would allow travelers to present their vaccine or COVID-19 testing status before boarding.
Over 130 countries today require a negative COVID test to fly.