[Alneyan]

You would order your ship to go to load fighters (Load Cargo, Fighters) at planet A and drop them (Drop Cargo, Fighters) to the sector where carrier B is. Carrier B will pick up the fighters, and all the other ships/bases/planets with cargo storage will take the remaining fighters if Carrier B doesn't have enough space. In case you are afraid there won't be enough storage space at sector B, you can order your ship to launch all fighters before going back to planet A.

Once you have a working line, you can click on Repeat Orders, and your ship will follow its orders until further notice. However, do give an order of "Load Cargo" before moving your ship away, if it happens to be over planet A. Otherwise, you will have a problem when repeating orders. And if you aren't playing 1.91, make sure your ship has some storage space left before picking up the fighters; otherwise, it may cause a bug resulting in the cancellation of all orders.