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My understanding is that BP has made this a “no-fly” zone and the gov’t. goes along with it.
Could be that the area is extremely dangerous.
Gas pockets can knock-out airplane engines among other things.
Some of the parts over the rigs were already no-fly zones. I pretty sure any NEW no-fly zones have little or nothing to do with the health of pilots. It has everything to do with appearances. However, reports from the ground suggest something weird is going on down there.