IF you flew non-stop from the westernmost airport in Pensacola, FL to the airport in West Yellowstone, MT. that's a 1600 mile flight one way - if there's a direct flight, which there isn't. The shortest Interstate only drive is 2300 miles one way. At 500 miles a day, that's 10 long days out of your 14 to 21 days just driving, leaving you roughly 5 to 10 days to "see the sights". And it doesn't include visits to the Tetons or the Grand Canyon. The land area of YNP is larger than 3 of our smallest states. One lap around the grand loop in YNP is 140 miles, and its slow. As far as sights, the only thing you're going to see is Interstate signs, and when you get home, you'll need a vacation from your vacation.
