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Ok first thanks for the link. Unfortunately that information is not for MD88s but the entire Delta fleet! That includes low price goliaths like 777s, 767ERs, MD11s, L1011s, etc.
Delta Air Lines has only 8 B777, 59 B767ERs, and 14 MD-11s, most of the MD-11s are parked in the desert and no L1011s, these aircraft operate predominatelyt international flights, with the associated added costs of international flights, landing fees, taxes, meal service, and more highly compensated flight deck and cabin crews, etc. OTOH Delta has 120 MD88s, 16 MD90s, 52 B737-200s, 26 B737-300s, 71 B737-800s, 121 B757-200s. I don't think that you will find that the CASM shifts by nearly 50% from 15cents to just over 10 cents based on a handful of aircraft. Skywest has a fleet wide CASM of 15.3 cents, ACA has 15.5 vs. Delta's 10.42 cents, or Alaska's 8.25 (an airline that flies narrow bodied jets). If you want to draw the conclusion that 75 widebodied aircraft drove down the CASM of 406 narrow bodied aircraft in the domestic Delta fleet 50% I think you are mistaken.
However, if you are wanting to argue that the 777 is so remarkably cheaper on a CASM basis due to it's size, than wouldn't your logic hold true for the MD-88 vs the RJ?
Aircraft efficiency is driven much more by the inherent efficiencies of scale and utilization rates versus crew cost. As a rough example, DAL's total costs are approximately $15BB, of that approximately $1.5BB is crew cost. A 10% shift of crew cost has a fleet CASM effect only .1cents. If DAL pilots made 500% more than they do today, the DAL fleet CASM would equal that of Skywest. Crew cost is not the overriding issue on each aircrafts CASM. Your point that the 777, L1011, MD-11 and 767er and other wide bodied aircraft are super efficient is interesting. I was wondering what your logic was on that, could it be economy of scale?
While trying to pin down the CASM industry wide for MD-88 sized aircraft might be nearly impossible, perhaps a bell weather for the MD88 and similar aircraft might be Alaska with a reported CASM of 8.25 cents. That is significantly less than any RJ carrier. Skywest, a large CRJ carrier reports a CASM of 15.3 cents and ACA 15.5. At the end of the day, I have not found a single regional carrier flying CRJs that has a CASM that is near 8.25cents. Quite simply the CASM of an RJ is significantly higher than the CASM of most any mainline jet. The segment cost might be lower, but the seat cost is higher. That makes the RJ the ideal aircraft for thinner markets, but not such a good choice for larger markets.