Flights to New York by BA alone today will have something like 2900 seats on 11 flights. That could be reduced to 7 A380 flights.
This is why I don't understand why the A380 has struggled. There is constant griping about lack of slots at main hubs (esp LHR), yet operators seem unwilling / unable to take basic decisions like this. Surely one airline does not need a service every 90 minutes to maintain market share? Frequency is important on short hops - especially on other modes where spur of the momoent decisions can be made - but not on trans-Atlantic and other long haul corridors.