In  a new study that  has come out, electronic devices and cell phones do have the potential to be dangerous to avionics during flight. While we do not have many details of the survey yet, this should be interesting if the airlines decide to ban use of all electronic devices.

Researchers, led by Carnegie Mellon University, say cell phones or laptops could disrupt cockpit operations, especially global positioning devices that are increasingly being used to help land planes safely.
Researchers monitored radio emissions from passengers on three airlines with the support of the Transportation Security Agency.
Carnegie Mellon’s Granger Morgan says the disruptions are enough to impact a plane’s navigation or other systems.
But he also says there’s never been an accident clearly caused by electromagnetic interference.
The researchers recommended that the Federal Aviation Administration and Federal Communications Commission work together to investigate in-flight use of cell phones. via WHO TV