While FTT is not a widely known engine maker like Rolls-Royce or Pratt & Whitney, the over-20-year-old business has been awarded multi-million dollar contracts and has developed a turbojet for cruise missiles and unmanned aerial vehicles.The news comes just a few months after every major manufacturer said it would not help Boom create an engine for Overture, with Rolls-Royce saying the "commercial supersonic market is not currently a priority for us."CFM International joined the trend in October when CEO Gaël Méheust said the company doesn't "see a significant market for an engine that targets a very small potential niche.""But, if it is successful in building the jet and the engine, then they get their aircraft and have very unique intellectual property and a business advantage because they will not rely on a third-party engine maker," he explained.Overture is expected to carry between 65 and 80 passengers in an all-business configuration, traveling between New York and London in as little as three and a half hours."