This might soothe your fears:
http://www.newton.dep.anl.gov/askasci/gen99/gen99845.htm
According to the site (which is itself based on statistics gotten from government websites):
1 in 6800 people die in the U.S. per year from car accidents.
1 in 1.6 million people die in the U.S. per year from plane accidents.
Between 1994 and 1998, according to the government website they cite:
Average deaths by car per year = 41,616
Average deaths by airplane per year = 169
If I recall there's a chapter or two devoted to the psychology behind things like this in Levitt and Dubner's
Freakonomics to the effect that the reason travellers in your situation will opt for the car rather than the plane in spite of the numbers is that the actual process of an accident is so much more terrifying in the case of the plane than in the car.
So if you find such thoughts creeping into your head, just remember that the
thought of the car accident, however more "palatable" it might be than the plane accident, won't save you from the statistical reality!