The Delta Flyer was the name given to a shuttlecraft by three con artists in 2376, who used it for purposes of deception.
The aforementioned con artists, known as Dala, Mobar, and Zar, impersonated Captain Kathryn Janeway, "Commander" Tuvok, and Lieutenant Commander Chakotay, respectively. In their ruse, they called their ship the Delta Flyer, after the Delta Flyer attached to the USS Voyager – claiming that its dilapidated condition was due to it having been through so much – and used Voyager's story to steal from others and sell meaningless memberships to the Federation. Eventually, the real Voyager caught up to the ship and its occupants. (VOY: "Live Fast and Prosper")
The bridge of the ship was a redress of the USS Defiant bridge set from Star Trek: Deep Space Nine.
According to Issue #135 of the Star Trek: The Official Starships Collection, Dala's 'Delta Flyer' was a type of cargo shuttle. This ship was approximately 30 meters in length, had a maximum speed of warp factor 9, and a crew complement of 3. Its armaments included phaser emitters.