Related: Ask Hotwire's Henrik Kjellberg How To Rent A CarĪmtrak provides train and/or bus service to a number of cities in Arizona, including Flagstaff, Kingman, Phoenix, Yuma and Tucson. Ground transportation services include car rentals, airport shuttles and limousines, taxis and bus service into downtown Tucson on Sun Tran's routes 6 and 11. Among the major airlines serving this airport are US Airways, Southwest, American and United. Tucson International Airport is the second busiest in Arizona. The other airport serving Phoenix is the Phoenix-Mesa Gateway Airport, located about 32 miles east of downtown Phoenix. Other ground transportation services are rental cars, airport shuttles, taxis and limousine. The airport's Sky Train connects passengers from Level 3 of Terminal 4 to the Valley Metro Light Rail, with service into downtown Phoenix. Other airline carriers include Alaska, United, Delta, Hawaiian, Jet Blue, American and British Airways. US Airways and Southwest Airlines represent nearly 75 percent of all the airport's traffic. Serving more than 40 million passengers, Phoenix Sky Harbor International is America's 10th busiest airport. Smaller airports include Grand Canyon Airport and Phoenix-Mesa Gateway Airport. By Air: The two primary airports in Arizona are Phoenix Sky Harbor International Airport and Tucson International Airport.