These are small, unmanned flying machines. They can be controlled by occupants using a Remote Flyer. They also carry energy weapons of some kind, which can be able to destroy enemy targets, such as Breeder fighters and even another one of their own fighters.
Jack O'Neill and Teal'c were able to control an entire squadron of aerofighters. However, after learning that the Eurondans planned genocide against the Breeders, for their "disregard for genetic purity". O'Neill was able to use one of the aerofighters against the Eurondans, attacked the fellow aero-fighters, and sent one of his own to a collision course for the Eurondan defense field generator. (SG1: "The Other Side")