Yeah, I mean it's not like AQ are fixated on committing terrorist acts against civil aviation targets or anything. Grow up.
It would only be entrapment if the agents had instigated and encouraged the plot. In this case, it seems the suspect instigated the plot and sought assistance in executing it. More importantly, if the suspect was happy to drive what he believed to be a truck full of HE into an airport terminal building, he was clearly prepared to see the plan through to the end. It is perfectly legitimate for law enforcement agents to provide 'assistance' in such cases, in order to gather sufficient evidence to secure a prosecution.