Aerial refueling craft was eventually modified by Airspeed to Cobham's specification, for a non-stop flight from London to India, using in-flight refueling to extend the plane's flight duration. Meanwhile, in 1929, a group of U.S. Army Air Corps fliers, led by then Major Carl Spaatz, set an endurance record of over 150 hours with the "Question Mark" over Los Angeles. Between June 11 and July 4, 1930, the brothers John, Kenneth, Albert, and Walter Hunter set a new record of 553 hours 40 minutes over Chicago using two Stinson SM-1 Detroiters as refueler and receiver. Aerial refueling remained a very dangerous process
North Carolina Highway 150 150 and NC 18 split. NC 150 heads due west to Boiling Springs, where the route turns due south across the Broad River to end at the South Carolina state line. SC 150 continues south across the line toward I-85 again and Gaffney, South Carolina. NC 150 was designated around 1929 as a spur route from the first NC 15, which is now mostly part of US 29. Its first routing ran west from Salisbury to Mooresville. By 1931, the route was extended through Lincolnton to US 74 in Shelby. The highway previously linking Lincolnton and Shelby was designated as