Date: 29 Jun 97 16:47:04 From: email@example.com (EDHUGO) Organization: AOL http://www.aol.com References: 1
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Mach number varies with temperature, not headwinds or weight. B727 - Mach .78 B737 - Mach .76 B767 - Mach .82 B747-200 Mach .84 B747-300/400 Mach .85 Those are the recomended Mach speeds. Every airline can modify that depending on their company policy.