I've been emailing the game designer, Phil Eklund about some rules questions and he mentioned to pass on the information that "Airships At War" (combines Luftschiff & ZRCV) and the seperate expansion Riesenflugzeugabteilungen are both almost out of print (OOP)
Phil only has about a dozen copies left of each. (1 less now that I've ordered my copy of Riesenflugzeugabteilungen)
So if you're thinking you'd like this game or been holding off on getting this game until you "get around to it", I'd seriesly start considering making a move soon before you have to resort to ebay or BGG Marketplace.
Nothing worse than finding a great game, but being unable to get a copy of it!
As mentioned in other threads, Sonic Quill Publications has bought the rights to the game and 3rd Edition is now available. The new version primarily reorganizes the rules to be more game friendly. Check the other threads for more details.