Stratolaunch is a company aiming to launch rockets from their rather large custom aircraft. Use this tag for questions to the aircraft itself. Questions about the rocket portion may be asked on https://space.stackexchange.com
Stratolaunch was founded by Paul Allen to launch rockets from its rather large split-body aircraft, designed by Burt Rutan. It is designed to carry up to a 13,500 lb rocket into the stratosphere for launch (traditional rockets have to both ascend and accelerate, while this would largely save the cost of ascending)
The aircraft is expected to begin flight testing in 2018. No plans have been announced by the company as to when rocket testing will begin.