Is it faster to fly than to drive to grandpa's house (1176 miles away according to mapquest), after the time spent going to the airport, waiting in security lines, and getting a ride from the airport to the final destination are considered, with a family of four that can't afford to cut it close?
They answer is yes. In real life, it took 11 and a half hours all told. By car, according to mapquest, it would have taken 18 hours and 13 minutes. But, it is less of an edge than I would have expected. The actual time in the air, of course, is only about a third of the total for travel by air.