Squadron leader was a title used by various organizations.
Squadron leaders attached to the 1356th Tactical Fighter Wing embarked on Shadowstar Station in the 2290s included: Sarah Delacroix, N'ssit , David Paris, Jr., and Kulwant Mahdee Singh. (Star Trek: Shadowstar Station: "Pomp and Circumstantial Evidence")
The Tal Prai'ex used the term squadron leader as a title, and was usually used to designate the most senior flight controller on a ship when its shuttlecraft or attack fighters were deployed in battle. (RIS Bouteina)