I think the terrorists will give he airlines a miss for a while, lord knows they have plenty of other options.
Once you have people that are willing to kill themselves they have simplified their operations a thousand fold, no timing devices necessary, no complex escape routes, no chance of your people giving information to the security services.
A car driven into a tunnel, or a vehicle of homemade explosives driven onto something like the Golden Gate Bridge,hell, they dion't even need explosives, a road tanker full of petrolium is a very effective bomb.
We are a target rich envoirement as they say.
Before all this happened I was wondering how long it would be untill those folks swarming at the French end of the channel tunnel try to physicaly hijack a train, they all also in a no lose situation, they don't care if they are caught, as long as they are caught on the English side.
We live in interesting times, fortress Europe and America??.
Ironic, we may have to build our own iron curtain.