..but if you have an average car journey to the airport, followed by an average flight - the riskiest part is the flight.
For General Aviation maybe, but not for commercial airline flights, not by a long shot.
E.g., there's been
no passenger fatalities due to a US airline accident since Feb, 2009. That's 6+ years of
zero fatal accidents.
For comparison, in the same time period about 250,000 (!) people died in US car crashes, an average of 37,000 deaths per year. No matter how you slice it (per trip, per travelled mile, per hour, etc.), the fatal accident rate for cars is going to be > 0.