Not much is known about the Bell Valiant Mk II. It was designed as a lightweight fighter, that would fly in swarms, being cheap, very lightly armed and armored. Due to unknown reasons, it has a model for in game use but was never implemented.
Crimson Skies and Crimson Skies: High Road to Revenge are a pair of games featuring a sundered America where its splintered states are at constant war with each other thus the highway system was never developed leading people to adopt aircraft and zepplins as the preferred mode of travel and air piracy is a constant threat.