The destination for the majority of air traffic into Dayton is the Dayton International Airport, near the junction of I-70 and I-75 north of the city. Dayton International is served by nine airlines. In 2004 more than 1.4 million passengers were enplaned at Dayton. Seven general aviation airports are located throughout the Miami Valley.
Highways into metropolitan Dayton include two major interstate freeways, east-west I-70 and north-south I-75; I-675, a bypass connects these highways and provides direct access to the city from Columbus and Cincinnati. U.S. 35 extends from east to west through the southern sector of Dayton. State routes leading into Dayton from points throughout the state and the immediate vicinity are 4, 202, 48, 49—all with a general north-south orientation.
Regional Transit Authority (RTA) provides regularly scheduled mass transit bus service throughout Montgomery County and in parts of Greene County; RTA operates special routes to Wright-Patterson Air Force Base and Wright State and Central State Universities. Dayton is one of the few U.S. cities to have retained an electric trolleybus system.