120A passes Lyon Park and reverts to a state-maintained road at an intersection with Putnam Avenue (unsigned NY 982C). Continuing on, the highway serves King Street School before crossing from Port Chester to Rye Brook several blocks later. In the latter village, the route slowly bends northward toward the Connecticut state line. It eventually reaches the boundary, at which point NY 120A begins to run northwestward along the state line, with the southbound lane in New York and the northbound lane in Connecticut. A short distance later, the route connects to the Hutchinson River Parkway and its Connecticut continuation, the Merritt Parkway (Route 15), by way of a modified cloverleaf interchange. Not far from the interchange, the highway bends northward to fully enter Connecticut. Although the road is located outside of New York, it is maintained by NYSDOT and considered by the DOT to be part of NY 120A. In Connecticut, NY 120A travels generally northwestward through the town of Greenwich, intersecting several streets of local importance, including Greenwich's locally maintained continuation of Anderson Hill Road (CR 18). The foray into Connecticut ends soon afterward, and the route proceeds to straddle the state line for another . Along this stretch, the route passes a series of commercial buildings in an otherwise residential area. Another New York-maintained stretch in Greenwich, Connecticut, soon follows as the route veers north to bypass the grounds of Westchester County Airport. As the route heads past the airport, it meets Rye Lake Road, Greenwich's connection to both the airport and Airport Road (CR 135). Past Rye Lake Road, NY 120A serves the Griffith E. Harris Golf Club and several mansions on its way back to the New York–Connecticut state line. Just north of the airport, NY 120A turns westward onto Gateway Lane, a small east–west street leading back into New York and the town of North Castle. Gateway Lane and NY 120A both end just inside the state line at an intersection with NY 120. Here, NY 120 changes names from Purchase Street to King Street as the route continues NY 120A's course along the state line. History The portion of Westchester Avenue from Purchase Street in Harrison to North Pearl Street in Port Chester was originally designated as part of NY 119 in the 1930 renumbering of state highways in New York. By the following year, a spur route connecting NY 119 to NY 120