Long Island MacArthur Airport, formerly known as Islip Airport, is a public airport in Ronkonkoma, New York, within the Town of Islip in Suffolk County, on Long Island. Covering 1,311 acres, the airport was established in 1942, was activated in 1943, and began serving as a commercial airport in 1960. It has three runways and two helipads. Owned and operated by the Town of Islip, MacArthur Airport serves Nassau and Suffolk counties as an alternative to John F.