The One That Almost Didnt Exist
Despite technically predating FB-05 / Sylvie, FB-04, or Niko, was first used after multiple other aircraft (in fact, he was first made before I started naming my aircraft!). Niko was the first aircraft in my career playthrough to have a jet engine. However, the sheer cost made him unusable. Between the research lost to get jets, and the high cost to launch Niko, his existence nearly caused a lot of trouble. Sylvie was made to get out of this situation, and overtook Niko's would-be niche. Eventually, FB-06, Fenrir, was made. He was a racer. However, some courses required something too fast for the prop-driven Fenrir to keep up with. I then returned to Niko, and built a new racer.
Fenrir could break 250 m/s with rocket assistance.
Niko can break 600 m/s with only jets.
Unlike most of my aircraft, Niko doesn't have trim, because you're probably gonna use slow-mo anyway. He doesn't really need flaps, so he doesn't have any. He works as a long-range aircraft; he got me to the South Pole from Ali, where it would've take Sylvie hours. However range is limited, so you have to manage fuel carefully. For races, just slam full throttle and use slow-mo.
Enjoy.