There have been discussions on the site before whether electronic devices interfere with aircraft systems or not. I just got this link in an e-mail from the Hawaiian flight safety office.
http://www.aero-news.net/index.cfm?printable=1&ContentBlockID=cd752a3a-584c-4ba3-bbed-93555f2b2ade&
http://www.aero-news.net/index.cfm?printable=1&ContentBlockID=cd752a3a-584c-4ba3-bbed-93555f2b2ade&