|Owner:||Mr. Mayweather sr.|
|Operator:||Earth Cargo Service|
In 2141, the Horizon encountered a Deltan ship. Travis Mayweather, who was fifteen at the time, described the Deltans as very attractive and very open. (ENT: "Bound") The Horizon once came under attack by Nausicaan pirates; it barely escaped in one piece. (ENT: "Fortunate Son")
In January 2153, the Horizon was attacked by the same pirates that attacked the ECS Constellation many weeks prior. Mayweather managed to upgrade the ship's plasma cannons by connecting them directly to the ship's impulse engines. This, combined with his expert piloting skills, allowed the Horizon to withstand the attack. (ENT: "Horizon")
Among the planets visited by the ECS Horizon were:
The assignment patch for the Horizon was created by Anthony Fredrickson, a design task provided to him by Michael Okuda. "Because this was the Horizon, I did a star dropping behind the horizon and an old-time sailing ship with a star glowing at the top of its mast," Fredrickson recalled. (Star Trek: Communicator issue 144, p. 36)
According to a deleted scene from "Fight or Flight", the Horizon made a two light year journey from a planet called Livinius to another called Belarn Prime when Mayweather was a child. The trip took the freighter almost nine months. The deleted scene can be found on ENT Season 1 DVD.
According to the Pocket ENT novel Kobayashi Maru, the ECS Horizon was the starship Horizon that visited Sigma Iotia II, as mentioned in "A Piece of the Action". The fate of the Horizon was unclear; by the end of the book, it was deemed missing and presumed destroyed by Romulan action. This connection to the Original Series episode was also suggested by the set decoration of the ship in "Horizon", as a hard-bound copy of a book beginning with the title Chicago Gangs can be briefly glimpsed on a bookshelf in Travis' quarters aboard the ship.