Re: MD-xx question
this is purely from way old memories, probably fairly vague, and probably contains inaccuracies. that said:
MD-81 is a stretched DC-9 with updated engines
MD-82 has the low-drag tailfin and higher thrust engines
MD-83 has extended range
MD-87 is a shortened-fuselage, longer-range with different engines (also had low-drag features which other variants lacked)
MD-88 is an MD-83 with glass cockpit
MD-90 has a stretched fuselage ahead of the wing and the extremely large engines in the back. also has glass cockpit.
Doug Taylor is probably the best person to ask about this....hth
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