PPRuNe Forums - View Single Post - Why do the re-engined narrowbodies get new type designations?
Old 31st Dec 2019, 21:17
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lomapaseo
 
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You need to define what you mean by performance. If it's as simple a $$ per seat mile, it has no relationship to Cert basis.

If it's altitude and/or stall characteristics than likely a designator etc.
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