SOUNDS INEPT ENOUGH TO BE EITHER THEM OR JUST A LONE NUTTER:

Passenger Ignites Explosive on Delta Flight (Fox News, December 25, 2009)

A male passenger possibly linked to terrorist organization Al Qaeda ignited a powdery substance prior to landing on a Delta Airlines flight to Detroit Friday, Fox News confirmed. The man is believed to be Nigerian. [...]

The suspect, who ABC reported suffered second-degree burns, told federal investigators he was connected to Al Qaeda, though authorities are questioning the veracity of that statement, Fox News confirmed. A federal situational awareness bulletin noted that the explosive was acquired in Yemen with instructions as to when it should be used, ABC said.