"One of the advantages of the Eurostar is that you arrive in the heart of any city you travel to. Airports are usually a considerable distance from the city center."
and one of the disadvantages is the cost, especially when there are SO many low cost European airlines that fly between cities for as low as 9 Euros. Most airports are at most 30 minutes from downtown, with shuttles, subways, and busses providing cheap fare......and much less costly that the Eurostar.....
It is ridiculous to set a detective story in New York City. New York City is itself a detective story...
AGATHA CHRISTIE, Life magazine, May 14, 1956