SEATTLE and LOS ANGELES—Boeing says airline requirements for a potential 757 replacement or middle-of-the-market (MOM) sector aircraft are coalescing on performance targets that will not only be tough to reach but also challenging to meet in a modular design that could also be scaled down to replace the 737. “We’ve probably seen over 30 customers and talked to them about really what they are looking for in an airplane bigger than the 737 MAX family,” Boeing ...


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