“the 9/11 attackers were trained, & funded by Al-Qaida.”
Al Qaeda is a CIA’s data base of the Afghan Mujahedeen. It is not Bin Laden’s military base. The Mujahedeen were funded mostly by Saudi elites and trained by the CIA in Operation Cyclone to fight the Soviet.
The Mujahedeen later rebelled and had to be eliminated, exactly as the case was with ISIS.