Parasite Fighters

"The idea of using an aircraft to launch another aircraft has been around since at least the First World War. Such "composite" aircraft became nothing particularly unusual, with experimental aircraft like the Bell X-1 and drones being launched off carrier aircraft platforms on a routine basis. However, the notion of actually launching and then recovering an aircraft in mid-air -- for example, a heavy bomber carrying its own "parasite" fighters for escort -- was more ambitious, and in fact nobody's ever really made a go of it, if not for lack of effort."

http://www.airvectors.net/avparsit.html