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Transport Canada CADORS — aviation occurrences

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

402,356Total occurrences
1,437Distinct airports
2,622Fatalities

Top occurrence categories

CategoryCount
Other138,274
ATM/CNS105,165
System/component failure or malfunction [non-powerplant]55,860
Aerodrome39,871
Undershoot/overshoot33,566
Navigation Errors24,583
Airprox/TCAS alert/loss of separation/(near) midair collisions23,191
Bird22,536
System/component failure or malfunction [powerplant]19,162
Medical13,785

Top airports

AirportCount
TORONTO / LESTER B. PEARSON INTL ON (CYYZ)19,858
VANCOUVER INTL BC (CYVR)12,867
CALGARY INTL AB (CYYC)12,828
MONTRÉAL / PIERRE ELLIOTT TRUDEAU INTL QC (CYUL)12,216
WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG)6,429
HALIFAX / STANFIELD INTL NS (CYHZ)5,406
EDMONTON INTL AB (CYEG)5,030
OTTAWA / MACDONALD-CARTIER INTL ON (CYOW)4,836
QUÉBEC / JEAN LESAGE INTL QC (CYQB)4,244
Kelowna4,144

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
202523,227
20268,316

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