While Airbus was hoping to market the A318 as a regional jet alternative, laws in both the U.S. and Europe have kept it in the same class as larger aircraft for calculating charges such as landing fees, limiting the type's market potential. The aircraft is powered by two CFM56-5 or Pratt & Whitney PW6000 engines with maximum thrust ratings of between . Launch customers Frontier Airlines and Air France took deliveries in 2003, with Frontier receiving its aircraft in July of that year. The list price of an A318 ranges from $56 to $62 million, and operating costs are between $2,500 and $3,000 for each flight hour. Orders for the A318 have been relatively slow, but slightly better than for its direct competitor the Boeing 737-600. At 30 September 2017, Airbus had received 80 orders for this model compared to 69 for the 737-600. The sales pace has been influenced by the strong sales of the Bombardier CRJ900 and Embraer E-Jets series. The biggest A318 customers at 30 September 2017 were Governments, Executive and Private Jets (20), Air France (18), Avianca Holdings (15), GECAS (12) and Frontier Airlines (9). On 10 November 2005 Airbus announced the A318 Elite. The Airbus A318 Elite is aimed at the medium-range market for flights of up to range, with a choice of two cabin layouts seating up to 18 passengers, and powered by CFM engines. Comlux Aviation became the launch customer by ordering three A318 Elite aircraft. In September 2010, Airbus confirmed that from 2013 the Airbus A318 would become available with "Sharklets", wingtip devices which reduce lift-induced drag and improve efficiency through reduced fuel consumption. The optional devices, which will also be available on other Airbus A320 family models and are manufactured by Korean Air Aerospace Division, will increase the range of the aircraft to – an increase of over a standard A318 with 107 seats in a two-class configuration. The Airbus A318 is a small commercial, narrow-body (single-aisle) aircraft with a retractable tricycle landing gear and is powered by two wing pylon-mounted turbofan engines. Two suppliers provide turbofan engines for the A318, CFM International with the CFM56-5B engine and Pratt & Whitney with the PW6000 engine. It is a low-wing cantilever monoplane with a conventional tail unit having a single vertical stabilizer and rudder. Overall, the A318 is over six metres shorter and around lighter than the A320.