[dawn53]

Prior to takeoff there was a 30 minute "security" delay.

I saw that too on a news banner on TV. What is a "security delay."

Does that mean the plane was delayed because it took longer to get people checked than they anticipated, or does it mean they had a threat about the plane?

[justlurking]

What is a "security delay."

Probably a random check. The FAA has mandated security sweeps on planes on a random basis. I don't know the criteria for selection, but there's no notice.