Although probably no one is still following this thread, I feel obligated to self correct a little here. Goggle really does their homework, I checked around online and the average wind speed at 60,000ft is around 20Mph, so well within spec for LTE (in fact there is an average wind speed minimum at 60kft, which is obviously why they picked that speed) I erroneously assumed the wind speeds had to be really high at that altitude and they are not.