I remember that episode, as I was one of the few "Lone Gunmen" fans. The airliner incident took place at night when there would have been hardly anyone in the towers.
...I was one of the few "Lone Gunmen" fans... I was one that at least tried the show. Maybe they should have shopped it to SciFi (I *like* "The Chronicle", even started to record Lexx...).
I don't remember this epi, but I lasted maybe three shows.