I found the answer to my question...

From: 2010 August Archive - Musings of The Global Traveller

Free availability tools gone

Posted on: August 1st, 2010 by: The Global Traveller
Some free access availability tools (eg seatcounter.com) have recently stopped working, apparently the old ITN interface is no longer available. Paid subscription availability tools still work at KVS (some methods are unavailable but decent coverage remains) and Expert Flyer (not affected).
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Regards,
Moisés Alves