There are a lot of 320s parked the moment, American West, Canada 3000, Fly FTI, Monarch, Sabena, Swissair, Virgin Alantic and Lufthansa have A320 series aircraft parked/stored at the moment.
On top of this their is about another 40 aircraft on the market at the moment up for lease.
If United are in trouble, thats another 142 airframes, good time to start an airline with A320s I guess.
Z