http://www.gizmag.com/nasa-glider-launch-satellites-tgals/36010/pictures#2

Recently, DARPA unveiled its ALASA system for launching satellites
from fighter planes. Now NASA is upping the ante with its Towed Glider
Air-Launch System (TGALS), which is designed to launch satellites from a
twin-fuselage towed glider. Under development by NASA's Armstrong Flight
Research Center at Edwards Air Force Base, California, it's designed as an
economical method for putting spacecraft into low-Earth orbit with the first
test flight of a scale prototype having already been conducted.

Thanks to Ollie.