Attack fighter 6-4 was a Starfleet attack fighter in service in the 2370s decade.

In 2375, attack fighter 6-4 fought at the final battle of the Dominion War. Benjamin Sisko had Ezri Dax have the ship and attack fighter 6-5 follow the USS Defiant to help the Romulans after their flagship D'ridthau was destroyed and their lines began to collapse. (DS9 novelization: What You Leave Behind)

The episode referred to attack wing 6-4 rather than an individual ship.
Community content is available under CC-BY-SA unless otherwise noted.