The ECS Philadelphia was an Earth Cargo Service starship operating in the early-22nd century.

In the late-2140s, the Philadelphia visited planet Omega IV, its crew leaving behind replicas of American paraphernalia. Shortly afterwards, the ship and crew disappeared.

After USS Enterprise personnel discovered the American artifacts on Omega IV in 2268, Doctor Meijan Grey and the Denobulan sociologist, Crenfel, investigated the discovery. They deduced that the Philadelphia crew gave the native Yangs the replicas to encourage them to fight for their freedom against the Kohms. While on the planet, the crew contracted the Omega IV virus and died from it after they departed. (TOS episode: "The Omega Glory"; DTI novel: Forgotten History)

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