How do trade routes work?

[Odd.Man.Out]

I'm not sure I understand how trade routes are supposed to work in this game. I have many ships on each moon. Each moon has a landing pad. I want to set up a trade route between two moons.

Route 1: I set cargo for moon A to moon B and set it to repeat, but it does not repeat.
Route 2: I want to set cargo for moon A to moon B AND I want to send cargo from moon B to moon A. Doesn't let me do that. I'm just thinking logically how I would do it: one ship makes repeated round trips, shipping unique cargo from one moon to another.

[Hades]

For now, space routes depend on three buildings, Launch catapult, Mission control, Landing platform.
Landing platforms are only available when reaching 100 level 3 citizens. The repeat option only works from that unlock. Before, the repeat checkbox is of no use.
We will improve that screen by adding a hint regarding the availability of the "Landing platform" in the different planned destinations and greyed out the "repeat" checkbox to prevent misunderstanding.
For a repeating trade route to work out, each moon needs three buildings, one to recover the spaceship - the Landing platform, one to plan the route - the Mission control and the last one to send the ship in space - the launch catapult.