[JeffAtlanta]

Perhaps he wanted to detonate on the plane, but the marhsls pursuing him did not give him enough time to do it on the plane, so he ran outside, hoping to gain a least a couple of extra seconds to set off the device.

The marshals were only chasing him because he was running off the plane. They weren't chasing him because they caught him in the act of trying to detonate.

[Howlin]

The marshals were only chasing him because he was running off the plane.

Now you're wrong: the "chased" him into First Class AFTER he ran down the aisle saying he had a bomb in his bag.

[toddlintown]

"The marshals were only chasing him because he was running off the plane. They weren't chasing him because they caught him in the act of trying to detonate."

Really? Were you on the plane too or just The Great Carnec?