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It just is. If it wasn't then Delta, American, and other airlines would be using 717s. The look almost the same. Actually looks more like a streched DC-9 or something. But it does its job much better than the 717.
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Brian, the 717 is about 20-30% more fuel efficient than the DC9. The 717 is in the same series as the DC9
DC9, MD81, MD82, MD83, MD87, MD88, MD90, MD90EFD, 717.
It takes more than just being a better airplane for an airline to purchase it.
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Ok. My question is "If the 717 is better than the MD80 and the MD90, why is the MD80 and -90 used much more? Is it because the 717s will be replacing the MD80s and MD90s in the future?