Story in the NYT. The tests necessary to prove these devices cannot harm a flight are quite involved though, so the change will not happen soon:
Abby Lunardini, vice president of corporate communications at Virgin America, explained that the current guidelines require that an airline must test each version of a single device before it can be approved by the F.A.A. For example, if the airline wanted to get approval for the iPad, it would have to test the first iPad, iPad 2 and the new iPad, each on a separate flight, with no passengers on the plane.
It would have to do the same for every version of the Kindle. It would have to do it for every different model of plane in its fleet. And American, JetBlue, United, Air Wisconsin, etc., would have to do the same thing. (No wonder the F.A.A. is keeping smartphones off the table since there are easily several hundred different models on the market.)
Ms. Lunardini added that Virgin America would like to perform these tests, but the current guidelines make it “prohibitively expensive, especially for an airline with a relatively small fleet that is always in the air on commercial flights like ours.”
- Wikipedia: Federal Aviation Administration.