>its often much better to walk just outside the boundary of the airport

are you serious? what airports do you visit where you can do this as a suggestion without laughing. It's like telling the freshmen that there's a pool on the school roof.

even something as small like a Bob Hope in Burbank would be difficult. Most airports do not consider pedestrian traffic to the edge of their properties. I've done it once at that airport because my office was pretty much next door to the Fry's across the street. still made me regret that decision. I'm now in Dallas and even Lovefield pedestrian traffic past getting to the parking area is non-existent. From DFW? Forget it. Much like your suggestion