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bloomwood - you certainly can travel this way, but it is seriously expensive!
We flew to Washington, and then took the train to new York for two days and sailed from there, but lpots of 'seriously rich!) people do the trip both ways.
Unusually, the ship does not call anywhere on the Transatlantic trip - it's only in port at either end for less than a day before it heads out again, so a lot of people staying at either end either fly back, or pick up another cruise ship that will stop at various ports on the way home.
It is pricey, but fantastic value for money, and I do reccomend anyone to try it. We did this as a treat for ourselves to celebrate our silver wedding aniversary - we are nbow saving to do it for our thirtyeth.