That's a good question, and there's probably no correct answer. Many airlines can be firmly counted in more than one category, or in a grey area between two categories. Generally the legacies (the old hub-and-spoke airlines) are always major airlines. Southwest is traditionally a LCC, but could also be considered a national (large domestic airline) and a major (large revenues).
The federal government defines major airline as $1 Billion or more in annual revenue...this includes several large regionals, which used to be commuters. Some regionals are much larger than some national/LCCs.
Large cargo airlines like FDX and UPS are considered majors also.
Confused yet?
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