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Where Can You Fly Right Now? U.S. Airlines’ Summer Dreams at Risk

As carriers ramp up, Washington says travel warnings will cover 80% of the world’s nations.

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 A passenger arrives for a United Airlines flight at O’Hare International Airport on Feb. 5 in Chicago. 

 A passenger arrives for a United Airlines flight at O’Hare International Airport on Feb. 5 in Chicago. 

Photographer: Scott Olson/Getty Images North America

The vaccination drive has made U.S. airlines optimistic about a summer travel rebound, but their upbeat outlook is clouded by international markets that remain out of reach and raging infections in countries like India and Brazil.

Just this week, the U.S. State Department said it would declare about 80% of the world’s nations no-go zones. That’s made it harder for airlines to claw back overseas travel that includes more lucrative business-class seats.