WTC1&2 flashes of light :
Take the following video at 2:15, very impressive, several flashes of light at different height of the building.
WTC1&2 squibs :
Take the following video at 0:50
WTC7 flashes and squibs :
Nature of the second WTC hitting plane :
—> Anormal velocity of the plane ?
—> "A black plane" according to a fireman :
—> "A big grey plane", or "a plane without windows and a blue logo" :
—> Secondary explosions expected by the FBI :