Nothing can compare to the Concorde. I flew BA from LHR-JFK after a QEII cruise in 1995. I flew AF from JFK-CDG after my AF flight (a DL codeshare) had to return to NYC after losing oil pressure in the port engine around Cape Cod. AF put F and J pax on Le Concorde the next morning. Unbelievable feeling on that a/c. Lucky to have flown it twice. Service much better on the BA flight.