impacts of constructing and operating the system's first leg between Washington, DC and Baltimore, Maryland with an intermediate stop at BWI Airport. San Diego: San Diego is considering a high-speed maglev line to serve as a passenger transportation mode to remote airport sites under consideration. The cost estimate is approximately US$10 billion for the 120–150 km (80–100 mile) run, not including the cost of construction of the airport. Atlanta – Chattanooga: The proposed maglev route would run from Hartsfield-Jackson Atlanta International Airport, run through Atlanta, continue to the northern suburbs of Atlanta, and possibly even extend to Chattanooga, Tennessee. Official proposals also exist to extend the route to Nashville. If built, the maglev line would rival Atlanta's current subway system, the Metropolitan Atlanta Rapid Transit Authority (MARTA), the rail system of which includes a major branch running from downtown Atlanta to Hartsfield-Jackson airport. Orlando maglev: In December 2012, the Florida Department of Transportation gave conditional approval to a proposal by American Maglev to build a privately run 14.9 mile, 5 station line from the Orlando International Airport to the Orange County Convention Center. The department requested a technical assessment of the technology and said there would be a "request for proposals" issued to see if there are any competing plans. The route requires the use of a public right of way. If the first phase is successful American Maglev would propose extensions in two further phases (4.9 miles and 19.4 miles) to carry the line to Walt Disney World. Old Dominion University, Norfolk, VA: In 1999, Old Dominion University agreed to work with American Maglev of Atlanta to construct an on-campus student transportation link of less than one mile — using a smart train / dumb track design in which most sensors, magnets, and computation were located on the train rather than the track. Several other institutes of higher learning rejected the project with cost and safety concerns. While projected to cost less to build per mile than existing systems, the ODU maglev was never operational. After far exceeding its projected $14 million budget, a groundbreaking was held in 2001, the project was completed in 2002; and the technology failed: the vehicle lost its "float" and come to a full friction stop on top of the rail, damaging much of the system. American Maglev and ODU dissolved their relationship and the project became an internal university research project. In October