Well, rumors or at least speculation as to why some airlines decided is was not a threat.
I would be very curious to know why LH and LX made the switch only now. A LH spokesman was quoted on Friday saying that the detour had minimal cost and time impact, and LH have a history of implementing extra safety procedures or equipment at extra cost long before they become mandatory if risk assessment shows a safety benefit. So was their internal risk management team fast asleep? Did they not receive foreign ministry assessments of the safety situation or listen to what the Americans were recommending? After all, Air Berlin, which is in economic dire straits, decided to do the right thing some time ago, and while they have a decent incident record, they are not known to be pro-active on the safety front.