- Passengers are present far more often on accident flights than on nonaccident flights. They can exert pressure on the pilot, either explicitly or implicitly, to complete the mission.
- Night makes VFR challenging even in good weather. Incredibly, almost one-third of VFR-into-IMC accidents happen at night, even though very little night flying goes on in general aviation.
- Mountains are also overrepresented in accident reports. Terrain can both create its own weather and limit safe alternatives.
- Longer flights also seem to be more susceptible to weather accidents. On a 100 nm flight, it's generally harder to get trapped by weather.