Harrisburg International Airport (IATA: MDT, ICAO: KMDT, FAA LID: MDT) is a public airport in Middletown, Pennsylvania,[4] nine miles (15 km) southeast of Harrisburg. It is owned by the Susquehanna Area Regional Airport Authority. The airport code MDT refers to Middletown, the town in which the airport is located. Planes landing at MDT from the south are often routed near Three Mile Island Nuclear Generating Station a few miles from the airport. The airport, frequently referred to as HIA, is the... Harrisburg International Airport (IATA: MDT, ICAO: KMDT, FAA LID: MDT) is a public airport in Middletown, Pennsylvania,[4] nine miles (15 km) southeast of Harrisburg. It is owned by the Susquehanna Area Regional Airport Authority. The airport code MDT refers to Middletown, the town in which the airport is located. Planes landing at MDT from the south are often routed near Three Mile Island Nuclear Generating Station a few miles from the airport. The airport, frequently referred to as HIA, is the primary commercial airport in South Central Pennsylvania and is the third-busiest airport in Pennsylvania for passenger enplanements and cargo shipments behind Philadelphia International Airport and Pittsburgh International Airport.