Drop off at the airport since you will be flying out. Sometimes you don't have to pay a Drop off fee. I personally do not like the Summer PL story several issues when I rented. Like the Parkside store the best.
They will take you to the airport. It's a Enterprise at the airport just drop it off there.
That's likely out of their range, there's one at the airport, is suggest dropping it off there.
Why not drop the car at the Knoxville airport?
They'll usually shuttle around 20 miles or so, so they should. Call and request the service though, so they have someone available.
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