to satisfy to growing orders, leading to VASO's growing involvement in the aircraft's assembly. VASO announced in June 2017 that the two final Russian-assembled An-148s would be delivered, and the project would not see further development. For Siberian operators, Antonov plans a model with a higher gross weight and additional fuel capacity in the center tank, extending the range with 75 passengers from to . An "E" variant is also planned to offer a special range, which would serve as a platform for the "E1", capable of non-stop Moscow-Vladivostok services carrying 44 passengers. Design The An-148 aircraft is a high-wing monoplane with two turbofan jet engines mounted in pods under the wing. This arrangement protects the engines and wing structure against foreign object damage. A built-in autodiagnosis system, auxiliary power unit, and the wing configuration allow the An-148 to be used at poorly equipped airfields. Flight and navigation equipment features five liquid crystal display panels built by Russia's Aviapribor and a fly-by-wire system, which enables the An-148 aircraft to operate day and night, under instrument flight rules and visual flight rules weather conditions on high-density air routes. Similar to the Boeing 737, the main landing gear rotates into the belly of the aircraft when in flight, with partial doors covering the legs, and the sides of the tires remaining exposed. Built-in entrance stairs enable boarding and disembarking the aircraft without extra ground equipment. The manufacturer claims high fuel efficiency of the Motor Sich D-436-148 engines. The An-148-100 regional aircraft is the main model of the An-148. It seats 70 passengers at or up to 80 passengers at pitch in a one-class 2+3 seating layout. The aircraft is also configurable in a multiple-class layout which can carry fewer passengers, typically with four abreast business class. Variants An-148-100Amain version of the An-148. It has a passenger capacity of 85 in a one-class dense configuration or 68 in a two-class configuration, and a range of An-148-100Bextended-range version, up to An-148-100Eextended-range version, up to and a maximum takeoff weight (MTOW) of An-148-200unified with An-158 by the rear part of the fuselage. Hence maximum seating capacity is increased to 89 passengers in dense configuration, comparing to 85 for An-148-100. Planned for production in Kyiv with An-158. An-148-300previously called An-168, business variant, seating 8-40 passengers, with a range up to An-148DRLVproposed airborne early warning and control variant. An-158stretched fuselage version for 99 passengers in a one-class