You will find numerous blue prints around the city that will allow you to take two weapons and combine them together on the fly to create new super weapons. (gamingnexus.com)
The triggers are used to fire your guns, and each plane is equipped with a special super weapon tied to the B button. (gamerstemple.com)
You can copy up to three abilities at a time, with 175 different super weapons available. (gamingtrend.com)