The question still stands even if you take out the word “sustainable.” After the Concorde service was discontinued for economic reasons, we can’t help but ask what has changed almost 20 years later as Boom Supersonic are the only player in this space. The company is generating a lot of interest from big names in the industry like American Airlines so something must be different. Supersonic technology was deemed too expensive to operate as the Concorde business model started to shake even before the crash of 2000 when the Air France Flight 4590 plummeted soon after takeoff from Charles de Gaulle Airport in Paris, France. In recent years, Boom has emerged as a significant player in the aviation industry, promising…