Air Line State Park Trail

Air Line State Park Trail is a rail trail and linear state park located in Connecticut. The trail is divided into sections designated South (a 25-mile trail from East Hampton to Windham), North (a 21-mile trail from Windham to Putnam) a piece of the East Coast Greenway, and the Thompson addition (a 6.6-mile trail from Thompson to the Massachusetts state line). An additional 3.6-mile spur to Colchester is sometimes designated as part of the Air Line trail. At the Massachusetts state line, the trail connects to the Southern New England Trunkline Trail, a 22-mile-long trail to Franklin, MA built on the same right-of-way. Since 2018, the town of Portland, Connecticut has also maintained a 2.3-mile portion of the Air Line trail, connecting to the southern end of the state park at the town line with East Hampton.

The United States Department of the Interior recognized the southern section of the Air Line State Park Trail as a national recreation trail in 2002.