I am extremely worried about the first couple of 757/767 departures once flights resume. How do we know this was all the terrorrists?
Could not a few more be in departure lounges waiting for the ground stop to end that interfered with their plans? Maybe their plane was delayed by MX or traffic?
If you can grab 4, its not much of stretch to get 6 or 8...
Bolt the door, arm the crews, bring back the skymarshals on ALL flights.
Wino