I have an international flight that leaves around 8:30pm from JFK on a Saturday. I'm traveling with seven other friends from around the Cleveland/Columbus, Ohio area (haven't decided on which city we will all leave from yet, but that's beside the point). Anyway, my friends are convinced that we could get a rental car that morning on the Saturday and drive all the way to JFK and make it in time for the flight (~8 hours away at least). However, I am very skeptical of this, and I don't believe it is feasible to drive from Ohio to JFK for an evening flight in the same day, especially with factoring traffic, returning the car, and airport security.
Is there any way I should convince my friends that flying from Ohio to JFK would be much smarter, or am I too paranoid about driving in that it should feasible to make the drive and flight on the same day?