Dubai/London — The vaccination drive has made US 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 such as India and Brazil.
Just this week, the US 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...
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