Nobody ever said Seattle-ites were all that smart.
Here is more information on it...I don't know if this explains those planes or not. Very intriguing.
Quote:
The Germans went to elaborate lengths to hide factories with netting and smoke screens - even so far as to build dummy oil refineries with similar reference points to fool bombardiers trying to hit it instead of the real factory a few mile further on - it actually known to have worked once.
However, asides from that rare case, hiding a factory would ONLY work if no aerial - or any type of images - of the factory was in possession by the enemy before the pre-mission photo-recon picture had been taken. Hiding a SINGLE item this big never worked - the bridges, rivers, prominent intersections etc would all still be there to allow a proper bomb drop on the factory. You have to hide everything around it within a mile so that the person toggling the bombs could not be sure exactly where it is. Off by 10 seconds means you miss the whole target. Thus you need to fake the scale in the camouflage or shift it over by 1/2 mile by making a new complete factory along with roads, intersections etc to match the original.
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http://www.taphilo.com/history/WWII/...ng/index.shtml