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The inaugural flight to New York with British Airways has just taken off. I wish BA the very best of luck with this route and hope it works this time.
IMO it won't as its slot sitting on the JFK end.
BA were using an AA slot out of Heathrow which they have now returned so they have this extra slot for the moment.
Should they want to increase the Heathrow service level again this will go away as sure as eggs are eggs !