In the summer time the eastern portion of this trail is somewhere where Blue-winged Warblers can be heard singing.

This specific portion of the Air Line State Park Trail has a parking location on East Thompson Road in Thompson, Connecticut. If you follow the trail eastbound for approximately one kilometer, you will reach the Massachusetts border. There is a side trail at the Massachusetts and Connecticut border that will bring you to the tri state border of Massachusetts, Connecticut, and Rhode Island. In addition to being a good spot for someone who is looking to go birding in three different states simultaneously, it hosts good birding opportunities as well.

The Air Line State Park Trail winds nearly 55 miles from the northeast corner of Connecticut, where the state borders Massachusetts, down to East Hampton in the heart of the state. The pathway is nearly seamless, with only one major gap through Putnam. Over the state border, you can make a contiguous connection to the Southern New England Trunkline Trail, which heads more than 20 miles east to Franklin, Massachusetts.