on 3 occasions vce-muc-iad, and one occasion blq-fra-iad we were NOT cancelled. the plane had not been sent from usa to germany, but we ended up in germany scurrying for a place to stay and a place to eat.
do not fly through germany in the winter, if you can avoid it. they have fog, and snow, and no planes show up.
sure would have been nice if we could have spent that extra day in venice, instead of munich.