Haverhill Riverside Airport & Seaplane Base was an airfield operational in the mid-20th century in Haverhill, Massachusetts. The airport was owned and operated by William Slavit, or Capt. Red Slavit as people used to call him. The airport code for Haverhill river side airport was MA04. Here is a link to an info article about it http://airportnavfinder.com/airport/MA04/. Red Slavit died in 2008.
