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From: ziegler@lzmi.UUCP
Newsgroups: net.auto
Subject: DC-10 at 55 MPH
Message-ID: <232@lzmi.UUCP>
Date: Tue, 26-Jun-84 21:54:25 EDT
Article-I.D.: lzmi.232
Posted: Tue Jun 26 21:54:25 1984
Date-Received: Thu, 28-Jun-84 04:02:49 EDT
Organization: AT&T Information Systems, Lincroft, NJ
Lines: 7

> How come your friendly neighborhood DC-10 doesn't have to go 55?
> I bet it would get better milage at a slower speed too.

Quite the contrary - at 55, a DC-10 would have to stay on the ground,
which would be most inefficient.  The faster a jet goes, the higher it
can fly (within reason), and the higher it flies, the thinner the air. 
The difference between air density at 0 and at 35,000 feet is
significant.