It seems to me that there are people out there forgetting that there are passengers and crews lives at risk here. Not perhaps today or tomorrow but we just dont know the longterm effects of this stuff on engines. Anyone fancy being 180 mins away from the nearest diversion with the hot sections in both engines melting? I'm not an engineer or pilot but have seen what glass beads and sand can to to hot sections and it isn't pretty. Shoot me down if you like but the it seems to me there is to much guess work going on here. The other problems the airlines have is just how much of any damage to engines if it did happen would be covered by insurance. Big crash yes. knackered engine probably not. Big bills they can hardly afford at this point.
Right. My small rant over.