Dallas/Fort Worth International Airport (airport code DFW) is 4th busiest airport in the US and 8th busiest in the world. The airport has five terminals, A, B, C, D (serving international passengers), and E, which is currently undergoing construction to add 54,000 more square feet of interior space by 2017. Terminals A and C serve American Airlines passengers exclusively. Dallas/Fort Worth Airport has two hotels attached to the airport, the Grand Hyatt DFW inside Terminal D and the Hyatt Regency DFW adjacent to Terminal C. The airport is 18 miles from downtown Dallas and 24 miles from downtown Fort Worth with a variety of transportation options from buses (through Dallas Area Rapid Transit ? DART), rail lines (through Trinity Railway Express - TRE), taxis and rental cars. The Dallas/Fort Worth area is the 4th largest metropolitan region in the US featuring world-class attractions from amusements parks to art museums.