3. Both Southwest and American Airlines have delays in their flights caused by airplane maintenance issues (or repairs, broken parts etc). Due to the amount of airplanes 1 available on hand at the airports both face a different amount of risk. Southwest has 10,000 airplanes flying a day and American has 6000. Southwest expects 800 airplanes to need repairs while American expects 300 to need repairs. The actual results for Southwest will range from 650