Airports often have special rules, pickup fees, etc. Drivers don't want to pay an $8 fee just to make a loss on your journey. As soon as you're a few yards out of the airport, none of that applies and a driver will be happy to take you.
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
You won't be able to walk to Downtown Boston, obviously, but Logan Airport is theoretically walkable if you're in East Boston. I'd still take the shuttle bus to the Airport T station where you can do the same walk to the greenway.
You could also take a shuttle to a local hotel or car rental, but that is breaking some rules.
But there is a pedestrian walkway the entire way. With traffic lights at crosswalks and everything.
LAXit is on Sepulveda, but it is safer to cross the street to a parking lot. I'll admit I underestimated the distance. It is closer to 300 yards:
You can also take the SkyTrain for free within Sea Island (which is not well known, I feel) - 2 stops to Templeton, and there are probably plenty of Ubers around there, since there is an outlet mall near that station, or at least a much shorter walk into Richmond.
LAX: walking paths and signalized crosswalks get you all the way to the hotels east of Sepulveda, or take the free shuttle to the cell phone lot and order from there.
SJC: Cross the parking garage to the bike path and from there cross the street. Or just walk down the bike path
ORD, MDW: Free shuttle to the rental car facility, or take the L one stop.
MSN: kind of a long walk, but there are sidewalks the whole way
SLC: take the light rail one stop
PSP: dunno why you’d want to walk in the heat, but it’s a short walk on sidewalks to El Cielo Road
Bear in mind: The minimum wage retail staff that run all the stuff in the airport can’t really afford to pay even economy lot parking rates, so basically every large airport has some kind of public transportation if you know how to look for it.
Even easier to use one of the many taxi cabs waiting at the curb right by the terminal.