I did read that at the time, and it is interesting. But as James Lovelock says - one of the first people to alert us about rising co2 - smoke or soot is the only countermeasure we have now, but it is a very short term fix and the other gases mixed with it lead to rapid longer term warming.

Water vapour from planes (contrails) have a complex effect and is not yet fully understood see:

http://www.smithsonianmag.com/science-nature/airplane-contra...