Hmmm, I dunno though, 'spies' finding out the flightpaths conjures up a very different image in my mind than 'spotters' observing a routine. Could it have been a case of "it must have been spies 'cos we certainly weren't making basic stupid mistakes and underestimating the enemy, no sir!
Someone even tried to claim it was a B-2 that was shot down at one stage