Something to remember the next that you are on your cell phone and the airline stewardess tells you to turn it off
As far as having any basis whatsoever in fact or science (that the electronic signals from all your equipment might interfere with anything on the aircraft's systems), the answer is a resounding NO.
Confused? So is the FAA, which has essentially refused to undertake the appropriate research on this issue since cell phones popped up in the mid-80's.
Back then, when handheld cell phones were as big as a brick and put out a whopping five watts of analog power, the FAA turned to the Federal Communications Commission and asked whether such devices were safe. "Does it look like we have wings?" was the unofficial response of one FCC staffer at the time -- an individual who helped draft the letter back to FAA pointing out none too delicately that things that flew were the FAA's responsibility, not the FCC's.
The FAA disagreed, of course, and after more than a quarter century, both federal agencies are still in a standoff with neither willing to put forth the funds and the time to determine once and for all whether passenger electronics have any scientifically-proven potential of disrupting an airliner's equipment to the degree of compromising safety. . . .
In fact, despite thousands of pages written on the subject, there has never been a single U.S. incident of interference investigated and scientifically confirmed beyond question. Not one.
On every commercial flight, every hour of every day, there is at least one cell phone still on during takeoff and landing. People forget, they refuse or they just don't know how to turn the things off. How do we know? The devices ring!
There are 32,000 commercial flights per day over the U.S. alone. That means we test the hypothesis that personal electronics can interfere with aircraft systems 32,000 times per day just over the U.S., and yet we have not a single, solitary confirmed instance.
But here's the outrageous part: If there was even a slight chance that personal electronics could be dangerous -- and knowing that people don't turn all of them off in flight -- why would any sane regulator or airline allow even one device aboard with the battery attached?