'We've all been very frustrated the corridor hasn't opened. There's no reason not to open it. It's not data-driven,' said JetBlue chief executive Robin Hayes.
The carrier will fly its route between JFK and Heathrow starting August 11, but will bring down some of the flyings in September.
The airline will adjust the schedule monthly to match demand after that. The company didn't elaborate on plans for flights from New York to London's Gatwick Airport.
Said JPMorgan Chase analyst Jamie Baker: 'Naturally, this leaves us wondering whether JetBlue simply exhausted its pricing salvo prematurely, selling too much too soon too cheaply, and thereby not enjoying the summer yield momentum experienced by others,'
The US Centres for Disease Control and Prevention advised Americans against travelling to the UK, after cases of the Covid crisis delta variant climbed there.
The Biden Administration has kept travel restrictions in place for the UK and 26 other European countries. Americans who have been fully vaccinated in the US still must quarantine for 10 days on arrival in Britain.