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My understanding (form my own reading, and a few other comments on this post), is that they needed to maintain the existing 737 type rating, so that pilots would not need to be retrained (this I knew), but also apparently changing the type would mean they wouldn’t be allowed to grandfather in some old, no longer permitted, design elements. This latter bit is new to me and I haven’t seen it mentioned elsewhere so maybe take with a big bowl of salt :)

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