Data are nonexistent.
Data are unavailable.
For Canada, the total shown is the sum of the modal totals and has not been corrected for double counting. For Mexico, the total is the sum of air, road and rail only, and therefore the total number of transportation injuries is underrepresented. United States and Canada include injuries from both passenger and all-cargo flights. Mexico includes injuries from passenger flights only. For Canada and the United States, the air carrier data are for their own national flag carriers, operating both domestic and international flights.