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Safety · CADORS

Transport Canada CADORS — aviation occurrences

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

407,168Total occurrences
1,437Distinct airports
2,633Fatalities

Top occurrence categories

CategoryCount
Other140,578
ATM/CNS106,250
System/component failure or malfunction [non-powerplant]56,396
Aerodrome40,407
Undershoot/overshoot33,570
Navigation Errors25,073
Airprox/TCAS alert/loss of separation/(near) midair collisions23,462
Bird22,827
System/component failure or malfunction [powerplant]19,262
Medical13,910

Top airports

AirportCount
TORONTO / LESTER B. PEARSON INTL ON (CYYZ)20,147
VANCOUVER INTL BC (CYVR)13,038
CALGARY INTL AB (CYYC)12,932
MONTRÉAL / PIERRE ELLIOTT TRUDEAU INTL QC (CYUL)12,391
WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG)6,462
HALIFAX / STANFIELD INTL NS (CYHZ)5,479
EDMONTON INTL AB (CYEG)5,082
OTTAWA / MACDONALD-CARTIER INTL ON (CYOW)4,861
QUÉBEC / JEAN LESAGE INTL QC (CYQB)4,272
Kelowna4,244

By year

YearCount
19641
19681
19701
19861
19924
19933,083
19942,971
19953,037
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
202218,702
202321,208
202423,214
202523,383
202612,969

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