Everyone know the ‘J’afs Key.
But did you try it while a Megafreighter is docked and unload his cargo ?
Then the Mego push out light-blue cargo pods instead yellow ones. When you dont do anything, they fly to the station and disappear.
But when you order your freighters to load them, they fly to them instead.
I think thats a bug. I bet the Cargo pods inside the Mega-Pod become marked when you press the J key and the Mega Pod opened.