Originally Posted by
sbm12
The short answer is that it depends on exactly what availability you want/need.
FlightStats.com has a decent view into multiple classes for many (but not all) airlines. They recently instituted a policy requiring registration to access the data though it appears free for now.
Thanks, smb12, for the website. I have registered and it meets my needs. I am happy to use it for the moment - hope it will stay free.
Thanks to everyone else for replying as well. Appreciate all for your comments.