It all started with Qantas, they banned Dell laptops due to overheating batteries:
http://www.smh.com.au/news/biztech/safety-...6012601607.html
Now Korean Air is banning not only Dell, but also Apple iBooks and PowerBooks:
http://www.appleinsider.com/article.php?id=2019
So, if you've got one of the affected laptops, please check it with your airline before taking it into the plane. A major pain for long flights...
Luiz