With 1200 pilots you have 600 crews. Flying 900 hours per year translates to 540,000 pilot/aircraft block hours. With 100 aircraft this equals 5,400 block hours per year per aircraft. This results in 15.79 hours per day. The final figure does not reflect any of the 100 aircraft down for maintanance or other contingencies, or crews down for their required rest periods either. However no more than 200 crews operate all aircraft in one day. At the end of the day the airline is still understaffed. For short haul flights, in the case of RYR, a minimum of 4.5 crews per aircraft is required. Again this is becuase there are no overnights.