San Antonio International Airport is the first in the nation to use a new advanced technology service in its parking garage. Airport officials announced the new system on Monday. A private company called Metropolis runs the parking system, which eliminates check-in and check-out. Travelers can enroll their car's license plate at the company web site, which stores the info for future trips. Two more vehicles can be added to a traveler's account. Travelers can also reserve a parking spot ahead of time.