alt Hacker NewsIt helps a bit more than you imply, though: if you can launch from a higher altitude, you have less atmosphere to plow through. That lets you use more of your propellant to speed up instead of to push air out of the way.
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Rover222 • today at 2:26 PM
You're extremely limited by the amount of mass you can even launch from a mothership aircraft.
There's no future in this idea outside of small sat, and probably not even there.
You've just got the problem of building a fixed wing aircraft which can carry your rocket full of explosive propellant, successfully release it pointing in the right direction and then get the hell out of the way....