I TOTALLY agree with Spudd...was on an approach to STL last year, when the pilot had to abort the landing, just as it was touching down, due to another plane crossing the runway. Subsequently, we got a rather lengthly circular tour of St. Louis.
It was quite a headrush to say the least, and I am sure that these incidents happen all the time, but sure glad to know they can react so quickly and so well.