From a financial perspective, an airline is a very difficult business to operate profitably on a sustained basis for which of the following reasons? Group of answer choices (A) There is little or no data on how a US airline's competitors are performing (B) Airlines may use a lot of fuel, but it is very cheap because they purchase so much (C) Financial commitments are short term only, including labor and aircraft (D) The airline industry has very high capital costs, including aircraft, labor, maintenance, and fuel (E) Answers A, B, C, and D