Even assuming the stats are measuring the actual miles traveled and not the planned miles (I'm not sure that's true), the difference would be vanishingly small

Even assuming the stats are measuring the actual miles traveled and not the planned miles (I'm not sure that's true), the difference would be vanishingly small given how rarely planes crash on takeoff. The overwhelming majority of flights complete safely, so the denominator is barely changed at all if we don't include flights that crashed on takeoff.