To the west of Brooks Avenue, construction began in the mid-1960s on the Airport Expressway, a limited-access highway between I-490 and NY 33A (Chili Avenue) near the Gates–Chili town line. The highway was opened to traffic and designated as an extension of NY 204 by 1968. In between the end of the expressway and Brooks Avenue, NY 204 overlapped with NY 33A. As planned, the Airport Expressway would be extended eastward along the Brooks Avenue corridor to meet the Rochester Outer Loop (NY 47) just north of the then-Rochester–Monroe County Airport. On January 1, 1970, the NY 204 designation was officially extended eastward along the proposed highway; however, in the field, NY 204 remained routed on Chili and Brooks Avenues.