Terminal B in between pillar 8-12
Drop off your vehicle at the National/Alamo drop off. It is located down one level. Follow the signs to the rental car drop off on the left side of the loop where the taxi and shuttle buses sit. After dropping off the car walk to the rental car kiosks. Walk on the walkway away from the rental cars as renters will be bringing their cars back. There is an elevator about 70 feet down the walkway which you will take to the street level to get back to the airpirt.
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