Site to check flight load according to fare class?

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I did a search, but didn't find this (other than a reference to itn.net which redirects you to an AMEX site). Thanks!
expertflyer.com, but it requires a subscription.
http://publicbackup.com/shared/flyertalk/availability/
Quote: http://publicbackup.com/shared/flyertalk/availability/
Great--thanks!
Don't thank me, thank SchmutzigMSP for setting up the site.
Another one is www.seatcounter.com .
Expertflyer is still my favorite and AFAIK, it is the only that allows one to see 'hidden' fare classes on Delta (i.e., upgrade inventory like Z, V, G). For about $10/month, it's really quite a decent deal. Seatcounter.com allows you to see hidden fare classes (including upgrade inventory) for UA flights (which is not available on expertflyer.com)