I Googled it and went with the first answer I found, although checking the sources of my source, their numbers are off by a factor of eight; should be around eight million. Which means it would take an average of ~250,000 years to die in the plane crash, rather than the ~20,000 years I originally estimated. The argument remains intact, however; it would take another couple orders of magnitude to marginalize the risk for somebody whose life expectancy is in the hundreds of billions of years, and probably three orders of magnitude to eliminate it as a consideration here.