So the drive is 11 hours. The first 1-1/2 hours needs to be done whether you fly or drive, so the drive really only adds 9-1/2 hours. You need to get to the airport 2 hours before your flight, so the drive really only adds 7-1/2 hours, and that's assuming your flight leaves on time. Add in the time to claim your bags and get the rental car and get from the airport to your destination and you're probably only looking at saving about 6 hours by flying. No way would I go to the hassle of flying to save 6 hours (or less if there are any flight delays).