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MD-90 Efficiency Over MD-80

Fri Sep 25, 2009 1:03 am

Just curious to know how much more efficient is the MD-90 vs. the MD-80? Thanks.
Just when I think you've said the stupidest thing ever, you keep talkin'!
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RE: MD-90 Efficiency Over MD-80

Fri Sep 25, 2009 6:56 pm

If I recall, the MD-90 burns close to 15% less fuel on an hourly basis and carries 12 additional pax. I think the overall trip cost was about 16-17% lower for the MD-90 and 20% lower on a per seat basis for a 750 mile trip.

The problem was that it was a bit of a maintenance pig and MCD was well into its slow death at the time.

[Edited 2009-09-25 11:56:52]
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RE: MD-90 Efficiency Over MD-80

Sat Sep 26, 2009 3:20 am

Quoting Flighty (Reply 12):
Using that data (which I have also), we can compare DL MD-80s vs US 734s. During 2005, the DL MD-80 had an average flight distance of about 550 miles. The US 734 fleet had a distance of about 540 miles. DL seats 142 passengers; the US aircraft 144 passengers. DL about 1,180 gallons per revenue flight hour. US just about exactly 1,000 gallons per hour.

The MD-80 clearly burns more fuel than the 734. About 18% more, in the usage of DL/US.

This is from the competing thread: MD-80 Vs 737-400 Economics (by 1337Delta764 Mar 17 2008 in Tech Ops)

So I guess the MD-90 burned about as much fuel as the 734. It really should have had transcon range for it to have been competitive. I wish it would have. DL might have ordered more. It needed a new wing, I think. The engine was good, and the fuselage worked, but a new wing would have propelled it to success. Instead, McD relied on the already under-winged MD-80 wing for the stretched, re-engined re-placement, which was a mistake. I think the MD-90's shortcomings might have accelerated it's takeover by Boeing.

edit: Could a transcon MD-90 have justified equal fuel burn to the 733/4/5 srs, competed with the 757 upon its introduction, and given airlines justification to order or keep MD-90's over 737NG's?

[Edited 2009-09-25 20:24:36]
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RE: MD-90 Efficiency Over MD-80

Sun Sep 27, 2009 10:38 pm

Just a quick question.At the time the MD80 were introduced,wasn,t the CFM 56 already availiable?
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RE: MD-90 Efficiency Over MD-80

Sun Sep 27, 2009 11:49 pm

Quoting B767 (Reply 3):
Just a quick question.At the time the MD80 were introduced,wasn,t the CFM 56 already availiable?

CFM56 was still in the development phase when the MD-80 first flew in 1979. The first CFM56 in service was the large-fan CFM56-2 used in the DC-8-60 series re-engining program. I believe the first of the re-engined -70 series DC-8s went into service in 1981. The first smaller-fan CFM56-3 wasn't certified until early 1984 for the 737-300, the first of which went into service in late 1984.

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