Join Date: Aug 2007
Location: Cheshire / Wherever they send me
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Posts: 943
I would imagine too that the sound barrier (mach 1) is an issue. One of the big isses concorde had was that it wasn't allowed to travel over much land because of the sonic boom it created. This restricts the number of routes available a lot. IIRC, planes currently travel at about mach 0.8 - so not too far off mach 1 and the associated sonic boom issues.