The wing is supercritical, increasing aerodynamic efficiency by 20% and reducing drag by 8% compared to a non-supercritical one. The center wing box was originally intended to use carbon fibre composites. It was changed later to an aluminium design to reduce design complications. The engine's nacelle, thrust reverser and exhaust system will be provided by Nexcelle, with such features as an advanced inlet configuration, the extensive use of composites and acoustic treatment and an electrically operated thrust reverser. Michelin will supply Air X radial tyres. Its integrated modular avionics architecture is based on Ethernet. The landing gear is made in China by a joint venture of Germany's Liebherr and Avic's Landing Gear Advanced Manufacturing Corp: Liebherr LAMC Aviation. While the airframe is entirely made by Chinese Avic, most systems are made by Western-Chinese joint-ventures: with UTAS for the electric power, fire protection and lighting; with Rockwell Collins for the cabin systems and avionics, with Thales for the IFE, with Honeywell for the flight controls, APU, wheels and brakes; with Moog for the high lift system; with Parker for the hydraulics, actuators and fuel systems, with Liebherr for the landing gear and air management; and the CFM engine and Nexcelle nacelle are entirely foreign. Both Pratt & Whitney and CFM International offered to provide the engines for the aircraft, the former offering the PW1000G and the latter the LEAP-1C; the latter was ultimately selected. AVIC Commercial Aircraft Engine Co was also tasked with developing an indigenous engine to be used with the aircraft. The ACAE CJ-1000A was unveiled at the 2012 Zhuhai Airshow. The first CJ-1000AX demonstrator assembly was completed in December 2017 after an 18-month process, for an after 2021 planned service entry. Debugging was completed by 30 March 2018, culminating in May 2018 with its first power-on in a test cell in Shanghai, reaching a core speed of 6,600 rpm. In February 2020, Reuters reported that the US government considers to block GE from selling the LEAP-1C engine to Comac, citing concerns of reverse engineering, competition for Boeing, and military use of technology. In 2012 the C919 order book stood at 380 units worth US$26 billion, and averaging $26000/380round1 million. FlightGlobal's Ascend market values in 2013 were $49.2 million for the Airbus A320neo, (100.2-49.2)/100.2*100round0% less than its $100.2 million list price and $51.4 million for the Boeing 737 MAX-8, (100.5-51.4)/100.5*100round0% less than its $100.5 million list price.