As some added context for anyone who cares...

United States = provided needed drill cover to allow event to happen, set drill security to lowest level possible to allow for hacks (entire event ran via hacks for plausible deniability), provided needed access to secure systems (PENTAGON/NORAD/FAA), purposefully created breakdown in chain of command during event, and then provided all elements of the aftermath cover up
sidenote: All of which was done via CoG and its various branches including Kroll Int, PTECH and MITRE Corp (just to name a few) as well as a small group within the federal government itself in key positions such as Chaney, Rumsfeld, Zakheim to (just to name a few).

Israel = Managed/ran the WTC 1/2 elements

Britain = Managed/ran the Pentagon and WTC7 elements

Saudi Arabia = Used by US for wanted cover patsy's

Canada = Used by US to allow drill hacks to switchover to "live events" to ensure the event went down without being interception in any way (via the drill Vigilant Guardian, which put Canada in charge of the entire Eastern sector of US air defense during the attacks).
sidenote: Canada was the Blue Team (defenders), US was the Red Team (attackers).

Pakistan = Used by US for wanted patsy payment/paper trail