I can guarantee Comair and Mesaba are indeed. However you may be right about Compass. That's the only one I am uncertain about.
How can you guarantee that? Lot's of factors go into costs. Comair and Mesaba have very top heavy seniority lists. Comair has a lot of old airplanes, Mesaba has what 36 900's?. How many 170/175's (or 100/200 models if your a geek) does RAH operate? There are some economies of scale.
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