Nantucket Memorial Airport. Nantucket Memorial Airport (IATA: ACK, ICAO: KACK, FAA LID: ACK) is a public airport on the south side of the island of Nantucket in the U.S. state of Massachusetts. The airport is owned by the Town of Nantucket and is located three miles (5 km) southeast of the town. It is the second-busiest airport in the state, after Logan International Airport due to intense corporate travel to and from the island in the busy summer months.