This report introduces a revealed preference methodology to estimate the value to the United States Air Force of expediting F-15 fighter jet programmed depot maintenance (PDM). The Air Force has chosen to pay for intermittent PDM on F-15s, so F-15s must have enough value after PDM visits to justify PDM costs. Computations suggest expediting F-15 PDM by a month would be worth at least $75,000, but likely considerably more for younger aircraft.