anotherthing: So let's get researching, dude! We have a wonderful sandbox, with no commercial traffic in the way anywhere. And the airlines are losing so much money that I'm sure they'd be prepared to offer an airframe each if they were told it might get things moving in 24 hours.
Please STOP referring to BA009. This is unhelpful. Nobody is talking about flying through the plume. All that's happening is that it is feeding the media frenzy and popular panic about the risks. We are more likely to be talking about reducing engine lives (possibly substantially) than losing airframes.