I don't disagree, but to be fair about the time, there's at least an hour in the DC airport and at least half an hour in the Boston airport, and that's assuming

I don't disagree, but to be fair about the time, there's at least an hour in the DC airport and at least half an hour in the Boston airport, and that's assuming there are no delays on either tarmac due to planes being in the way of your gate or your plane needing something inspected or replaced. So it's more like 2.5-3 hours vs. 7 hours. Still probably worth the flight, depending on how much you like driving, but I think most people think only about the actual flying time, rather than the total time spent dealing with the airport process.