| Let me reiterate the other posters' comments. First, you need to indicate that you are asking for the airlines' biggest hubs/airports. Second, you need to set out what you mean by "biggest." Most arrivals/departures? Most passengers? Third, you should accept IATA airport codes as answers. E.g., "DFW" should suffice for "Dallas," "LHR" for "London Heathrow," etc. |