My understanding, which admittedly could be incorrect, is that the FAA's Aging Aircraft Safety Rule which came out in 2005 requires some intensive and costly inspections for transport airplanes over 14 years old. The rumor I heard is that as the Brasilias hit that mark, they'll simply be retired. Supposedly it just won't be cost effective to keep them in service.

So if that's true and I did my math right, they'll all be gone by 2011. Well, by 2012. Some of them might leave during 2011.