total of 780 aircraft of three variants: the single-seat F-18A fighter and A-18A attack aircraft, differing only in avionics, and the dual-seat TF-18A, which retained full mission capability of the F-18 with a reduced fuel load. Following improvements in avionics and multifunction displays, and a redesign of external stores stations, the A-18A and F-18A were able to be combined into one aircraft. Starting in 1980, the aircraft began to be referred to as the F/A-18A, and the designation was officially announced on 1 April 1984. The TF-18A was redesignated F/A-18B. Northrop's F-18L Northrop developed the F-18L as a potential export aircraft. Since it was not strengthened for carrier service, it was expected to be lighter and better performing, and a strong competitor to the F-16 Fighting Falcon then being offered to American allies. The F-18L's normal gross weight was lighter than the F/A-18A by , via lighter landing gear, lack of wing folding mechanism, reduced part thickness in areas, and lower fuel-carrying capacity. Though the aircraft retained a lightened tailhook, the most obvious external difference was removed "snags" on the leading edge of the wings and stabilators. It still retained 71% commonality with the F/A-18 by parts weight, and 90% of the high-value systems, including the avionics, radar, and electronic countermeasure suite, though alternatives were offered. Unlike the F/A-18, the F-18L carried no fuel in its wings and lacked weapons stations on the intakes. It had three underwing pylons on each side, instead. The F/A-18L version followed to coincide with the US Navy's F/A-18A as a land-based export alternative. This was essentially an F/A-18A lightened by about ; weight was reduced by removing the folding wing and associated actuators, implementing a simpler landing gear (single wheel nose gear and cantilever oleo main gear), and changing to a land-based tail hook. The revised F/A-18L included wing fuel tanks and fuselage stations of the F/A-18A. Its weapons capacity would increase from , largely due to the addition of a third underwing pylon and strengthened wingtips (11 stations in total vs 9 stations of the F/A-18A). Compared to the F-18L, the outboard weapons pylons are closer to the wingtip missile rails. Because of the strengthened nonfolding wing, the wingtip missile rails were designed to carry either the AIM-7 Sparrow or Skyflash medium-range air-to-air missiles, in addition to the AIM-9 Sidewinder as found on the F/A-18A. The F/A-18L was strengthened for a 9 g