 The result was a greatly improved maneuverability, range, endurance, and payload, plus the added overwater and hostile terrain safety of the twin powerplant configuration.To replace the T-33A, Portugal signed a letter of intent with the Skyfox Corporation in the middle of the 1980s for 20 conversion kits.The Força Aérea Portuguesa (FAP) proposed that Oficinas Gerais de Material Aeronautico (OGMA) in Alverca would undertake the conversions, but insufficient orders were obtained from other nations to motivate Boeing to continue with the project.