I absolutely adore this episode. Janine's character development throughout the series was indeed very well done. her choice to accompany the team on a mission was hilarious, as was the airport scene. i especially loved:
"Your Beautiful when you flush them out..." loved up Egon is put under the Genie's spell and he's quotes are funny.
but the episode is quite dark and scary for a children's cartoon. the hijack of the airplane and the joyride the passangers endure is quite hard-hitting (and funny) and i am surprised they showed this episode after the events of 9/11. Still, glad they did - i love this one!!!