[11th Commandment]

A-10's have cannons... The aircraft is armed with a General Dynamics GAU-8/A Avenger 30mm cannon, mounted in the nose of the aircraft.

But you are still correct, planes don't shell...

[elhombrelibre]

The AC130 has a 105 Howitzer; it shoots a shell. It’s the same shell fired out of the 105mm used by light infantry. The cartridge case is shorter, but the projectile is identical.