Question: What is an alias of the parent route of U.S. Route 366?

Context paragraphs:
U.S. Route 66 in Missouri: U.S. Route 66 (US 66, Route 66) is a former east–west United States Numbered Highway, running from Santa Monica, California to Chicago, Illinois.  In Missouri, the highway ran from downtown St. Louis at the Mississippi River to the Kansas state line west of Joplin.  The highway was originally Route 14 from St. Louis to Joplin and Route 1F from Joplin to Kansas.  It underwent two major realignments (in the St. Louis and Joplin areas) and several lesser realignments in the cities of St. Louis, Springfield, and Joplin.  Current highways covering several miles of the former highway include Route 100, Route 366, Route 266, Route 96, and Route 66.  Interstate 44 (I-44) approximates much of US 66 between St. Louis and Springfield.

U.S. Route 366 (1932–1939): U.S. Route 366 or US 366 was the designation of two child routes of the former U.S. Route 66 in New Mexico and Texas during the late 1920s and 1930s.  Both alignments of US 366 were original U.S. Routes created in 1927.  The first alignment was a route from El Paso, Texas to Amarillo, Texas crossing through New Mexico that existed until 1932.  The second was a route from Albuquerque to Willard that was previously designated U.S. Route 470 before 1932.  That alignment was canceled in 1939.

U.S. Route 138: U.S. Route 138, commissioned in 1926, is an east–west U.S. Highway in Colorado and Nebraska that runs predominantly northeast to southwest paralleling the South Platte River and Interstate 76.  Like all spurs of the former U.S. Route 66 and U.S. Route 99, U.S. Route 138 is an orphan route.  U.S. Route 38 was commissioned in 1926, but U.S. Route 6 was extended over it to Long Beach, California (but was truncated to Bishop in 1964).  Therefore, U.S. 138 still meets its former parent route.

Kentucky Route 336: Kentucky Route 366 (KY 366) is a 6.144 mi state highway in Hopkins County, Kentucky, that runs from U.S. Route 41 in Earlington to U.S. Route 41 again in southern Madisonville.

U.S. Route 66: U.S. Route 66 (US 66 or Route 66), also known as the Will Rogers Highway, the Main Street of America or the Mother Road, was one of the original highways within the U.S. Highway System.  US 66 was established on November 11, 1926, with road signs erected the following year.  The highway, which became one of the most famous roads in the United States, originally ran from Chicago, Illinois, through Missouri, Kansas, Oklahoma, Texas, New Mexico, and Arizona before ending at Santa Monica, California, covering a total of 2448 mi .  It was recognized in popular culture by both the hit song "(Get Your Kicks on) Route 66" and the "Route 66" television show in the 1960s.

Ohio State Route 366: State Route 366 (SR 366) is an east–west state highway in the western portion of the U.S. state of Ohio.  SR 366 has its western terminus at a T-intersection with U.S. Route 33 (US 33) nearly 1.50 mi northwest of Lakeview.  The route's eastern terminus is at State Route 117 about 1.50 mi north of Huntsville.  SR 366 runs along the western and southern edge of Indian Lake and provides access to homes and recreational facilities along the lake shoreline.  SR 366 was designated in 1939, and was extended in 1961.

U.S. Route 366 (1927–1932): U.S. Route 366 or US 366 was the designation of two child routes of the former U.S. Route 66 in New Mexico and Texas during the late 1920s and 1930s.  Both alignments of US 366 were original U.S. Routes created in 1927.  The first alignment was a route from El Paso, Texas to Amarillo, Texas crossing through New Mexico that existed until 1932.  The second was a route from Albuquerque, New Mexico to Willard, New Mexico that was previously assigned a different route number before 1932.  That alignment was canceled in 1939.

Maryland Route 366: Maryland Route 366 (MD 366) is a state highway in the U.S. state of Maryland.  Known for much of its length as Stockton Road, the state highway runs 11.17 mi from U.S. Route 13 Business in Pocomoke City east to George Island Landing on Chincoteague Bay.  MD 366 is the main east–west highway of southern Worcester County, connecting US 13 in Pocomoke City with MD 12 in Stockton.  The state highway was constructed starting in the mid-1910s from the Pocomoke City end.  MD 366 was completed between Pocomoke City and Stockton in the early 1920s.  The state highway was extended east to George Island Landing in the mid-1930s.

New Jersey Route 81: Route 81 is a state highway in the U.S. state of New Jersey.  The route is a freeway connector between exit 13A of the New Jersey Turnpike (Interstate 95) and U.S. Route 1/9 near Newark Liberty International Airport.  It runs for 1.18 miles (1.90 km), entirely within the city of Elizabeth in Union County.  A freeway called Route S100 was initially proposed on the current alignment of Route 81 in 1938; it, along with its parent Route 100, was never built.  The current route was conceived in the 1960s as a freeway replacement for Route 164, which followed Humboldt Avenue, a surface road.  It was to be designated Route 76, but was renumbered to Route 81 when Interstate 76 was created in New Jersey.

U.S. Bicycle Route 8: U.S. Bicycle Route 8 (USBR 8) is the northern most U.S. Numbered Bicycle Route which runs between Fairbanks and the Canada–US border in the state of Alaska.  The route lies entirely within Alaska, and much of it follows the Alaskan Highway.  It has two spur routes, U.S. Bicycle Route 108 and U.S. Bicycle Route 208.  Bike Route 108 starts in Tok and ends in Anchorage.  Bike Route 208 follows the Haines Highway from the Alaska Marine Highway terminal in Haines to the Canada–US border; it is planned to connect to its parent route in Haines Junction, Yukon.  The routes were approved by AASHTO in early May 2011, making them one of the first expansions of the U.S. Bike Route system since 1982.  Bike Route 8 has connections to U.S. Bicycle Route 97 in Fairbanks, U.S. Bicycle Route 95 in Delta Junction, and U.S. Bicycle Route 108 in Tok.  Bike Route 108 connects to U.S. Bicycle Route 95 in Anchorage.

Supporting paragraphs: U.S. Route 366 (1932–1939) U.S. Route 66
Answer: Will Rogers Highway