colinneagle writes: Airlines have seen almost no increase in the use of smartphones, tablets, and laptops among passengers since the Federal Aviation Administration ruled in October that they are now allowed to do so during takeoff and landing, a recent study found. Over a four month period observed by DePaul University's Chaddick Institute for Metropolitan Development this year, 35.9% of passengers used mobile devices at any point during the flight. In last year's study, while flight attendants still patrolled the aisles for devices that hadn't been shut off, 35.3% of passengers used devices during flight. Chaddick Institute director Joseph Schwieterman said many people may not be interested in using their mobile devices in-flight, and are simply excited for an opportunity to "use the time to sleep and chill out." Another contributing factor is the stipulation to the FAA's rule that still bans the use of smartphones for making phone calls or send text messages, the report noted. That may change soon, however. The FAA recently received public comment on a proposal to lift its ban on in-flight cellphone communications service, which has been in place since 1991.