Are ham radio contacts allowed from inside an airplane?
Two-way radios are just like any other communications device. If the captain says all such devices must be in flight mode at any particular moment during the flight, you are not allowed to use it and could be arrested if you do. Also, if the captain determines that something you are doing with your communications device is interfering with aircraft communications or navigation, he may order the flight crew to confiscate your device until after landing, and you may be subject to criminal charges.