The Federal Aviation Administration has found that up to three flights out of 100,000 are diverted due to smoke or fire in flight, but the situation is no less dangerous for being commonplace. Included: a DC-9 crashes into the Everglades after a fire causes the pilots to lose control; an MD-11 crashes after smoke fills the cockpit; a DC-9 loses its electrical systems two hours into a flight; a flame-engulfed plane crashes into a hotel.