Regarding the airlinerlist.com website, I like that one, as well. Those listings are done a little bit differently, though. They are arranged by aircraft (of course), but then they are done numerically by manufacturer's serial numbers, and then by line numbers. Unless you have those numbers in hand, the airlinerlist.com site can be tricky to navigate. But they do list a complete history of each aircraft, which is handy.
But, as for a quick and ready airliner or airline fleet inquiry, I'll go straight to Bill Harms' site.
Thank you, though, for reminding me about airlinerlist.com.
Tom in NO (at MSY)
"The criminal ineptitude makes you furious"-Bruce Springsteen, after seeing firsthand the damage from Hurricane Katrina