Aero L-39 Albatros L-39 Skyfox (L-39NG)

After the Albatros, Aero Vodochody had tried its luck with the L-39MS (L-59 Super Albatros) and the L-159 ALCA, but neither came close to the production volume or spread of their predecessor. In 2013 the idea of an advanced trainer derived from the L-159, the L-169 AJT, was floated; the company chose instead to return to the airframe it knew best. On 16 July 2014, at the Farnborough Airshow, it presented the L-39NG (Next Generation) project, a new-generation Albatros intended to contest the training market against types such as the M-346 and the Hawk at much lower purchase and operating costs.

In April 2015 Aero formed a partnership with Williams International, which supplied the FJ44-4M turbofan, and Draken International, which took responsibility for the type in North America and planned to operate its own fleet; for the rest of the world, Aero kept the modernisation of existing aircraft at its Czech facilities. The programme was split from the outset into two stages. Stage 1 offered Albatros operators the replacement of the old Ivchenko AI-25TL with the FJ44-4M, of almost identical thrust but considerably lower fuel consumption, with the Stage 2 avionics as an option. To demonstrate it, an L-39CA, airframe number 2626, was converted into the L-39CW technology demonstrator, which first flew on 14 September 2015 from Vodochody with factory pilots Miroslav Schützner and Vladimír Kvarda. Aero declared its development complete on 20 November 2017 and on 14 March 2018 announced its type certification.

Stage 2 is the aircraft covered here: a newly built L-39NG. It keeps the aerodynamic concept of the Albatros, but the airframe is almost entirely redone. A wet wing, with the fuel carried inside, replaces the original wing with its distinctive spindle-shaped wingtip tanks; the nose is shorter, the air intakes smaller and the cockpit, with a new canopy, has a greater step between the two seats. The structure makes partial use of composite materials, is considerably lighter and produces less drag, to the point that the manufacturer claims operating costs comparable to a turboprop. The FJ44-4M has electric starting and FADEC digital control, and the fully digital avionics, with no mechanical backup, come from Genesys Aerosystems. In June 2017 Aero announced four pre-production aircraft and in July it began manufacturing their parts: three prototypes and one pre-series aircraft. In April 2018 it also signed with Israel Aerospace Industries for the integration of IAI virtual training solutions.

The first prototype, construction number 7001 with military serial 0475, was rolled out on 12 October 2018 and flew on 22 December 2018, on schedule. In 2019, at customer request, Aero reordered certification so as to deliver the full trainer configuration directly; by September that year three test aircraft were flying: the L-39CW for avionics and spin and stall work, and the NG prototype for basic performance and ground vibration testing at the Czech Aerospace Research Centre, with weapons trials for the light attack role. Static fatigue testing began on 25 May 2020 to validate a life of 5,000 flight hours; by September 2020 the two flying prototypes had made some 300 flights, with two static airframes on the ground, and that month the Czech defence ministry certified the aircraft to supranational military standards recognised by the EU and NATO. Aero claims that life-cycle testing supports up to 15,000 hours, three times that of the original L-39. Fatigue testing was completed in January 2022 and in July 2022 the baseline version received EMAR 21 certification.

The first series aircraft, number 7005, flew in April 2023 and series production began in May 2023; as of 31 August that year the production outlook stood at 34 aircraft. Some 600 subcontractors take part, 400 of them Czech; at the start of 2024 the line reached a rate of one aircraft a month and 18 a year are expected for 2026. On 16 October 2024, at the Future Forces Forum conference in Prague, attended by President Petr Pavel, Aero renamed it Skyfox, a name linking it to the tradition of the L-29 Delfín and L-39 Albatros; a 2025 source puts its price at 15 to 20 million US dollars per aircraft.

The Skyfox is offered in several configurations: L-39NG.A1, a trainer with limited use of Eastern weapons; L-39NG.T1, a Western trainer without weapons; L-39NG.A2, a Western combat version under development, with maximum take-off weight raised to 5,600 kg and up to 1,650 kg of stores; and L-39NG.R1, a reconnaissance version with a Wescam MX-15E electro-optical sensor beneath the fuselage. Besides pilot training it can fly patrol and counter-insurgency missions with weapons on five hardpoints, two under each wing and one ventral: HMP 250 or HMP 400 pods with an M3P 12.7 mm machine gun, guided or unguided 70 mm rockets, Mk 82 bombs of 227 kg (including the GBU-12 Paveway II) or AIM-9 Sidewinder missiles.

Vietnam was the first export customer: in February 2021 it ordered 12 L-39NG.A1 for the 910th Air Training Regiment at Tuy Hoa, where they partly replace the L-39C; the first three arrived in early 2024, six had been delivered by August 2024 and the last in March 2025. Hungary ordered twelve aircraft in April 2022, eight T1 and four R1: the trainers were delivered in May, September and November 2025 and the reconnaissance aircraft are expected in 2028. In the Czech Republic, LOM Praha contracted four T1 in November 2022 for the Flight Training Center at Pardubice, which received the first in January 2025, and in September 2025 exercised the option for four more. Angola ordered four A1 in June 2026. Other deals never materialised: the Breitling Jet Team upgrade, the team having disbanded in 2019; the SkyTech and RSW Aviation orders announced at Farnborough 2018; the purchase of six aircraft approved by the Parliament of Ghana in December 2021; the four for Senegal, postponed in 2020; and Austria, which in December 2024 chose the M-346FA instead.