Recently I took another transatlantic flight with my family. I was reading Wolves Of Calla on Kindle DX, my wife was reading Hitchhikers Guide To The Galaxy on Kindle 2. Unlike previous time both devices survived the flight just fine.
It’s worthwhile to note that TSA folks made me take both Kindles out of my carry-on and run them through the security scanner separately just like they do with notebooks. But they’ve let them through without any problems of course.