Super Spy Deluxe
Super Spy Deluxe is a racial ability of the Birdmen to change the friendly code of a planet (and also the starbase). This ability has many useful functions.
In order to change a planet's friendly code, you must have at least one of your ships in orbit performing the Super Spy mission, with fuel aboard. That ship will have a 20% chance of changing the planet's friendly code. For each additional ship you have in orbit (with fuel aboard), your chance of changing the planet's friendly code increases +20%. So if you have 2 ships, the chance of changing the FC will be 40%. If you have 5 ships in orbit, the chance will be 100%, which means that you are guaranteed to change the FC.
Note: only 1 ship is required to be performing the Super Spy mission in order to change the FC, and gain the increased +20% chances. All that is required from the other ships in orbit is that they have fuel aboard.