Marlboro Airport, (IATA: MXG, FAA LID: 9B1) in Marlborough, Massachusetts, was a public airport. Its final owner was Sandra A. Stetson, widow of prior owner G. Robert Stetson, Jr. Robert died on April 27, 2012, at the age of 66. It had one runway, and at the end of its life averaged 37 flights per day with approximately 40 aircraft based on its field. Chapter 673 of the Experimental Aircraft Association was based at Marlboro Airport. In December 2018, Sandra Stetson sold the airport to Capital Group Properties, which plans to redevelop the site into the Airport Industrial Park.