Can you take CD players/mp3 players on planes to listen to instead of the airline's music and/or the sounds of noisy kids and people hacking up. I guess I won't be able to use the mp3 player on my mobile as that will have to be turned off right?
Yes, computers, MP3 players, CD players etc., you can listen to throughout the flight. It's just mobile phones that have to be switched off throughout the flight.
Actually, to think of it, it depends how large the airplane is. If it's a Boeing 767, 747 etc. then my previous answer is correct. If its an airbus or smaller they will mention on the tannoy whether you can or not. I've seen astewardess ask someone to put their music device away on a flight. But definately you cannot have your mobile phone switched on during any flight.