USA TODAY recently sent an informal airport survey out to more than 1,600 of the world's most frequent business travelers who volunteer information to the news outlet. Dallas Fort/Worth Airport finished No. 1 among U.S. airports, and Amsterdam's Schiphol airport ranks at the top of foreign airports. Least favorites were O'Hare and Paris' Charles DeGaulle. Atlanta, Detroit and San Francisco were favorite runners-up for domestic airports. In expressing his displeasure with CDG, one responder said, "I simply have quit flying ever into Paris Charles de Gaulle. It just doesn't work at all on any level. It's located way outside the city, it's a long, expensive taxi ride in, the design and layout are confusing, and there is literally nothing to do at that airport."