Data are nonexistent.
Data are unavailable.
For the United States, the number for total fatalities is less than the sum of the fatalities listed for individual modes because some fatalities are counted in more than one mode. 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 fatalities is underrepresented. United States and Canada include fatalities from both passenger and all-cargo flights. Mexico includes fatalities from passenger flights only.