 Quote by D H
You are ignoring the rocket equation.
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Not sure height buys you very much.
Some velocity helps but the fraction of fuel you need is still proportional to e
-dV
if you need dV of 10km/s for Leo then adding 0.25km/s for an airliner isn't going to do much,
the optimum first stage drop velocity is something like 1/3 of the final velocity.