While attempting to construct a whale tank in the cargo bay of the Klingon Bird-of-PreyHMS Bounty, Sulu discovered a Huey 204 in the Plexicorp yards, a ship which he had a nostalgic admiration for, describing it as like something he flew "in his Academy days."
Upon his return to the helm of the Bounty, Sulu had difficulty remembering how to fly the Bird-of-Prey after becoming accustomed to flying the Huey. (Star Trek IV: The Voyage Home)
The official designation for a Huey is UH-1 Iroquois. The nickname "Huey" is derived from the ships early designation of "HU-1", which stood for "helicopter utility." An early version of the script described this aircraft as a "Huey 205", which was a larger, upgraded version of the 204.