I am not sure how the bean counters figure out all this stuff but Frontier seems to be leaving lower cost airports: FLL for MIA, MDW for ORD and adding flights out of PHL instead of Trenton. IAD and CLE are not all that cheap to operate out of either. I am sure they will have pilot and flight attendant bases at all the mini hubs soon doing turns so they can save on hotels just like Allegiant. I am thinking the Denver base will shrink in 2015 even though they state otherwise.