my idea is different jetpacks types like a burst one where you kinda throw yourself instad of a steady fly (kinda like a slow doge) another jetpack idea would be a blink or a stage jetpack that goes faster the longer you use it ( in a perfect world i would do it so it doesnt have a cap so ppl with a lot of fuel get rewarded with more speed)
Those different types of flight work well as Tech Nodes, honestly.
Jetpacks as mecha parts are meant to be independent of function, after all.