Can you try downloading Flip4Mac from hrere http://www.microsoft.com/windows/windowsmedia/player/wmcomponents.mspx
Once installed reboot yoru macand let us know if it still does not work
Can you tell me what browser you are using?
I saw your reply earlier and I was wondering which web browser you are using to access the site with?
Can you try redownloading the Safari silverlight.dmg from here then reinstalling it and let me know if you still have the same issues after you reboot http://tiny.cc/4R7Cy
In that case we need to try and load Silverlight 1.0 onto your machine as it was the only version that was supported by PPC.
Can you try downloading this version from Filehippo and let me know if it will load http://www.filehippo.com/download_silverlight/3850/
Sorry that I was not able to help you get this sorted out, Hopefully Air America will change their policy and make their programming available to the Mac majority in the future.