American Airlines has agreed to buy 20 Overture aircraft from Boom, with the option to purchase an additional 40 planes if all goes well. The deal is one of the strongest shows of support for Boom yet, surpassing the potential 50-jet commitment United Airlines made last year. One wrinkle: Boom hasn’t yet built a working passenger jet.
The company plans to establish a manufacturing facility at North Carolina’s Piedmont Triad International Airport. It expects to begin construction later…