Unfortunately its a lot of premiums that the pax have to pay.
- Premium for carrying more fuel just to carry the fuel you will burn
- Premium for all the additional staffing requirements.
but most importantly.
- Substantial premium for the purchase cost of a plane (of which the design costs will be huge) that will only work on a few routes in the world and only a few airlines will purchase.
IMHO the only airline that has a chance of flying London-Sydney direct is Virgin
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Virgin Galactic that is
And at $200k just for a joyride flight that is going to be a substantial premium