Originally Posted by mob17
How can planes deviate so much from their course and not be stopped??
An aircraft can easily deviate from its scheduled flight plan. It's not difficult at all. The only way to stop one from doing so is to shoot it down. IIRC, the US did not have a policy to shoot down commercial aircraft which might have flown off course.
If the US shot down every aircraft that ever deviated from its flight plan, we'd have a whole new set of problems on our hands now wouldn't we?