Re: I'm not surprised they chose the Boeing 747
It's got a 125 tonne payload capacity and a cruise altitude of 35,000 feet, with a service ceiling of 45,000 feet. It flies at Mach 0.74 and has a range of over 6000 miles, double that of the military version, the Globemaster, and at $85 million per plane it's just 1/3rd the cost.
