choices for a minimum listed price of US$5,000 ($ in dollars ). 1936 was the last year for the "Airflow" appearance, while there were some enhancements and features added to entice buyers. A new grille, all-steel roof construction and a luggage compartment was added. The wheelbase was lengthened and the doors and side windows. The front windshield was either split or curved one piece on the Imperial Custom and continued to be extendable from the base outwards while a separate retractable cowl ventilator remained to provide fresh air inside the passenger compartment. Production numbers continued to fall to a total of 4,500 Series C-10 sedans and coupes and 75 Series C-11 sedans and limousines. A total of 10 Series CW were documented to be sold while the actual manufacture date were previous years that were registered, and dated as 1936 models. The pricing structure was simplified as US$1,475 ($ in dollars ) for the Series C-10 for the coupe or sedan, and US$2,475 ($ in dollars ) for the Series C-11 sedan or limousine. While 1936 was the most profitable season for Chrysler since 1929, the Airflow program was cancelled, and the Imperial Custom Airflows are recognized as Classics by the Classic Car Club of America. 1937–1939 Chrysler reverted back to body on frame construction and there were three models in this generation designated as Imperial. The polarizing appearance was modified with an return to "torpedo" styling, sharing the appearance of a long, straight hood and cowl and moving the headlights outwards into the front fenders with the more successful "Airstream" appearance. The Series C-14 offered the straight eight, shared with the Chrysler Royal C-16 . The Series C-15 was the Imperial Custom and the Town Sedan Limousine, with blind rear quarter panels and was available on request. The top level Imperial Custom Series CW continued to be offered but was very exclusive, using a wheelbase while eliminating the "Airflow" nameplate. Innovations for 1937 included built-in defroster vents, safety-type interior hardware (such as flexible door handles and recessed controls on the dash), seat-back padding, and fully insulated engine mounts. Brakes were 13-inch drums, then in 1939 they expanded to 14 inches, but shrunk to 12-inch drums in 1940. Front suspension was independent. Unusually for ventilation, it had a concealed crank to extend the base of the split windshield outward and the top edge of the engine hood was hinged at