For my campaign, set 10 years after FS2, I will put in a ship called the GTF Apollo II. From the outside, you can't tell it apart from the original Apollo, but under the skin it's almost a totally different ship. New reactor, new engines, new sensors, new missile hardpoints, it's like a new ship with an Apollo hull and cockpit.
Here are the specs:
TSF Apollo II
Advanced Space Superiority Fighter
Manufacturer: Makion Corporation
Max Velocity: 90 m/s
Max. Velocity with full power to engines: 120 m/s
Max. Afterburner Velocity: 200 m/s
Maneuverability: Equal that of the Ulysses
Allowed Primaries: Subach HL-7, ML-16 Laser, Disruptor, Advanced Disruptor, Akheton SDG, Avenger, Maxim, Morning Star, S-Breaker, Flail, Circe, Prometheus R, Prometheus S, Banshee, UD-8 Kayser, Shivan Light Laser, Shivan Heavy Laser, Shivan Mega Laser
Default Primaries: Subach HL-7, UD-8 Kayser
Allowed Secondaries: MX-50, Rockeye, Fury, Tempest, Interceptor, Harpoon, Phoenix V, Trebuchet, Stiletto, Stiletto II, Synaptic, Piranha, Tsunami, Cyclops, Hornet, Tornado
Default Secondaries: Harpoon, Tornado
Secondary Bank Capacity: 60, 60
Shield Color: 60 255 60
When the new Terran-Shivan Alliance began its crusade against the GTVA, it had the Shivan corporation Makion develop a new fighter based on the Apollo, which had an easy-to-modify spaceframe. Almost all of the craft is new, and it is better in every respect than its predecessor and its rivals, the SF Mara and GTF Myrmidon. This deadly amalgam of Shivan and Terran technology is currently available only to elite units, due to its prohibitive cost and the small number of units produced so far due to its newness.