The tactical flyer was a type of small attack fighter used by Starfleet. It was armed with phasers.
The craft were experimental as of 2257, when they were commandeered by Una for USS Enterprise in anticipation of trouble with Control. The flyers were used alongside Class C shuttlecraft and landing pods in the ensuing battle with a Section 31 armada. (DIS: "Such Sweet Sorrow", "Such Sweet Sorrow, Part 2")