That indicates hijackers with bombs. Strongly implies suicide squads. This is an al Qaeda/islamofascist/møøselimb signature.
There was speculation on another thread that it was Russian Mafia trying to discourage carriers from moving from 'their' airport:
Moscow's main airport Sheremetyevo, is run by the Russian mafia and was a complete disaster the last five times I flew out of it. Domodedovo is an up and coming competitor, and many airlines, sick of the Mafia's influence and cost, were trying to move flights to Domodedovo. I can see this as a warning to the airlines that are moving flight from SVO. ~ rebel_yell2
I think we're firmly in møøselimb territory...
****From It's Happening forum, from a self proclaimed jihadi
Or could planes have been shot down?