Ahem....pssst.....hey....Not just for aircraft, while some of the most notable are probably the GAU-8 Avenger(A-10) and the many variations of rotary cannons available to the AC-130, the most memorable for me anyway are the M-134( 7.62) and GAU-19( 50 BMG). There was a 20mm ADA version mounted to an M-113 called the VADS I belive. I'm sure there are other variations now.Yes, the Gatling gun was a crank operated repeater. There were many variations of the Gatling gun, and it was in use from about 1865 until the early 1900's.
The Gatling gun concept of rotating barrels is still in use today on aircraft cannons. The A-10 is famous for its huge 30mm cannon with rotatinng barrels.