Thrust control modules

The thrust control modules are a quest item

Location
They can be bought from Old Lady Gibson for 500 caps or 250 caps with a Barter or Speech check. With the Lady Killer perk, they can be obtained for free.

They can also be acquired by killing or pickpocketing Old Lady Gibson or taking her key and using it on the metal box containing the thrust controls. With a Lockpick skill of 50 or higher, the lock on the box can be picked.

Related quests

 * Come Fly With Me

Bugs
After completing the quest and obtaining the modules without getting them from Old Lady Gibson's metal box, you can obtain them again from the box and get another module, but since it is marked as a quest item, you will not be able to remove it from your inventory.