You mean a plane hitting a building? That was the only Al Quida attack ever on US soil (in fact, it is only AFTER that happened that the name Al Quida was even thought up!)
Being that any terrorist can claim to be part of al Qaeda and no question would come of it, that isn't necessarily true; the 1993 World Trade Center bombing, while not "officially" an al Qaeda attack (instead was committed under the command of the Blind Sheik), was later "adopted" and idolized by al Qaeda. Considering al Qaeda roughly means "the base" in Arabic, it is a broad organization of jihadists and mujahideen which pretty much anyone can fall under. Along those lines, the shootings outside the CIA headquarters in Langley also could have been considered an al Qaeda operation, since Mir Aimal Kansi fought with the group in the fight in Afghanistan. However, you are correct in saying that the first "official" attack committed by al Qaeda on U.S. soil were the attacks on 9/11.
Also, the name al Qaeda was thought up much earlier than September 11th. The organization was formed to combat the Soviet forces which invaded Afghanistan in the 80s, and was first coined "al Qaeda" by Bin Laden and Abdullah Azzam in 1988 after the Soviet withdraw.
WoW: Darsius (Earthen Ring) / GW: Denarr Trueblade / BF2: Slinky317 / CoH: Spectris (Justice)
This comment was edited on May 5, 12:06.