 operation yellow ribbon was commenced by canada to handle the diversion of civilian airline flights in response to the september 11 attacks in 2001. canada's goal was to ensure that potentially destructive air traffic be removed from united states airspace as quickly as possible, and away from potential u.s. targets, and instead place these aircraft on the ground in canada, mostly at military and civilian airports in the canadian provinces of nova scotia, newfoundland and labrador, and british columbia (and also several in new brunswick, alberta, manitoba, ontario and quebec) where their destructive potential could be better contained and neutralized. as none of the aircraft proved to be a threat, canada and canadians subsequently undertook to play host to the many people aboard the aircraft during the ensuing delay in reaching their destinations. canada commenced the operation after the u.s. federal aviation administration (faa), implementing security control of air traffic and air navigation aids (scatana) grounded all aircraft across the united states. the faa then worked with transport canada to reroute incoming international flights to airports in canada. during the operation, departing flightsâwith the exception of police, military, and humanitarian flightsâwere cancelled, marking the first time that canadian airspace had been shut down. as a result of operation yellow ribbon, 255 aircraft were diverted to 17 different airports across the country. ==deployment of emergency measures== immediately after the attacks on the world trade center, both transport canada and nav canada, the canadian air navigation agency, activated their emergency measures. ===transport canada=== transport canada activated its situation centre (sitcen) in ottawa at 09:21 et (13:21 utc). the sitcen is transport canada's emergency operations centre (eoc), originally constructed to deal with earthquakes along the west coast and had been used several times prior to september 11, 2001, including during the ice storms in ontario and quebec and after swissair flight 111 crashed in peggys cove, nova scotia. as personnel staffed the sitcen, key organizations such as nav canada, the department of national defence, the royal canadian mounted police (rcmp), [[canadian security intell
2001_in_Canada Aftermath_of_the_September_11_attacks Aviation_in_Canada CanadaaUnited_States_relations