I used to use KVS to check for upgrades, and then my home went all Mac, so it became a hassle to load Boot Camp on VMWare simply to check a flight.

So I've been using http://publicbackup.com/shared/flyertalk/availability/ -- the ITN.Net service....

....But that doesn't seem to show I class (upgrade) availability any more....

So what do folks recommend for a simple and quick lookup these days?