Quick Launch is a feature available in the Sandbox which allows a player to add station modules instantly to space. You can only use this feature 10 times for free. Afterwards, you need to purchase Quick Launches via Get Add-ons to use it.
Alternatively, for every 10 regular launches you complete, you will gain 1 Quick Launch.
This feature was added to Space Agency on April 27th, 2017.
Below is a list of parts available for Quick Launch: