Air Miles for a Greener Earth

http://www.environmentalleader.com/2008/04/23/major-aviation-industry-players-ink-climate-change-pledge/

I found this item in my research — Continental will let you purchase the offset when you buy your ticket. Also saw a story that Virgin is selling the offsets in the aisle, alongside the cocktails!

http://www.environmentalleader.com/2007/12/04/continental-airlines-launches-carbon-offset-program/