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SpaceShipTwo is a very much suborbital craft that would only have a range of a few hundred (maybe a thousand?) miles if used for travel. You'd have to build something much bigger to do antipodal travel like this.

The capability you need to go suborbital from one side of the Earth to the other is essentially the same as what's needed to go into orbit. (Thus all the ICBMs that got repurposed as orbital launchers.) Any vehicle that can't reach orbit probably can't do what BFR could do.




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