I guess my upcoming work trip will be car-free travel! There's an airport shuttle that picks up about four blocks from my house and travels the ~150 miles to the Minneapolis/St. Paul Airport. From that, over to London, and then it will all be trains and walking (and perhaps a bike share, though that was scary last time, since I'm not used to traffic on the left.)
I used to ride my bike to the regional airport, but prefer the shuttle. Time wise, it works out about the same, but I'm terrified of flying and it eliminates a flight. The shuttle also does better in inclement weather than the little planes.