Sft is talking about barrage balloons, which technically are not airships. An airship is a dirigible. That is, it has a solid frame with internal gasbags. The British airship programme effectively ended with the crashing of the R101 in Beauvais in the 30's
http://www.aht.ndirect.co.uk/airships/r101/Crash/R
101_Crash.htm
and Hitlers German airship programme ended with the Hindenburg. The Americans did use airships, mainly for long range reconnaissance,although they did experiment with a system to launch fighter biplanes. The planes hung from a hook attached to the top wing and were dropped (with engine running) and were recovered by the pilot hooking on to a 'trapeze' before being winched back inside the airship. Just as an aside, the Goodyear airship hangar at Akron, Ohio is the largest in the world. It is so big, clouds form in the roofspace and it rains indoors (or so they say!).