Originally Posted by
GUWonder
Sticking to commercially scheduled passenger flights and lumping in regional partners (e.g., United Express, American Eagle, etc.) under the airline code used for most ticket sales ... while measuring it by flights or by destinations?
By destinations, after UA and AA, I'd guess US-HP or Spirit. By flights, I'm guessing NW is up there.
By destinations, US and Spirit each tie with 6. By flights, its between DL/CO/NW but I think its more likely between NW and DL.