BY THE NUMBERS - T-37 FLIGHT MISHAP HISTORY 13,518,203 - Total hours flown since 1956 136 - Lifetime number of destroyed aircraft (1.01 per 100,000 flying hours) 27 - Number of pilot fatalities in the T-37's lifespan (.2 per 100,000 flying hours) 7 - Number of destroyed aircraft in the past 15 years 1 - Number of pilots lost in the Tweet in the past 15 years