Kalran: Tales of the four nations/Air control tower

Due to a combination of of rugged landing gear, VTOL capability, and their spiral engines, Which can run for weeks before needing a refuel and start up in an instant, meant that the Navaheim planes can hide anywhere, thanks to their illusion generator, to surprise their foes, despite being made of bronze and propeller powered. With many of them and their pilots hiding in their homeland forest, ready to strike anyone who attacks.

But this rather independent nature means that a commander must built an air control tower to coordinate them. This tower also doubles as the radar, since their command centre doesn't have enough space for it. And is also equipped with scanning equipment's, allowing the commanders to briefly look through the fog of war.

With their VTOL and landing gear a Navaheim plane can land almost anywhere, becoming stealthed but immobile, to gather salvage, make repairs, and/or reload their armament.