Actually your right Guinea,
I found evidence to support plane of hate was implemented on oct 31st 1999.
http://web.archive.org/web/199911050...com/index.html
This is the patch notes 4 months after ro opens. It says people were exploiting with levitate to skip around plane of air. So it was less than 4 months after ro for poair.
http://www.tski.co.jp/baldio/patch/20000203.html
I will look for a date, but so far your timeline seems pretty correct. I can't complain eitherway. I'm just glad they are still working on content for the server!
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