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Safety · CADORS

Transport Canada CADORS — aviation occurrences

Civil Aviation Daily Occurrence Reporting System data covering Canadian airspace, 1993–2026.

405,223Total occurrences
1,437Distinct airports
2,626Fatalities

Top occurrence categories

CategoryCount
Other139,756
ATM/CNS105,715
System/component failure or malfunction [non-powerplant]56,217
Aerodrome40,165
Undershoot/overshoot33,570
Navigation Errors24,897
Airprox/TCAS alert/loss of separation/(near) midair collisions23,358
Bird22,667
System/component failure or malfunction [powerplant]19,230
Medical13,861

Top airports

AirportCount
TORONTO / LESTER B. PEARSON INTL ON (CYYZ)20,033
VANCOUVER INTL BC (CYVR)12,982
CALGARY INTL AB (CYYC)12,893
MONTRÉAL / PIERRE ELLIOTT TRUDEAU INTL QC (CYUL)12,322
WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG)6,449
HALIFAX / STANFIELD INTL NS (CYHZ)5,453
EDMONTON INTL AB (CYEG)5,062
OTTAWA / MACDONALD-CARTIER INTL ON (CYOW)4,855
QUÉBEC / JEAN LESAGE INTL QC (CYQB)4,260
Kelowna4,218

By year

YearCount
19641
19681
19701
19861
19924
19933,083
19942,971
19953,036
19963,123
19973,561
19984,051
19994,412
20004,927
20016,125
20027,180
20037,155
20049,853
200510,840
200611,837
200713,234
200814,564
200912,351
201013,851
201114,736
201215,402
201315,331
201414,256
201514,791
201614,868
201717,477
201817,775
201919,261
202012,683
202114,949
202218,701
202321,208
202423,213
202523,352
202611,058

Occurrence counts reflect reporting activity and traffic volume, not a measure of relative safety. Source: Transport Canada — CADORS, under the Open Government Licence – Canada.