Delta hasn't advertised its Porsche shuttle at Atlanta's Hartsfield-Jackson International Airport, the busiest airport hub in the world by number of passengers.
The reopening of the airport is expected to be gradual, possibly starting with Delta and U.S. Airways shuttle flights to New York and Boston, Massachusetts.
Two to three cars work a morning shift and three or four patrol the Atlanta airport in the afternoon and evening, said Delta's Michael Cousin, who supervises the airline's car shuttle.