How to turn off cellular radio in Lollipop/JellyBean using adb?

I've been trying to find out how to kill/turn-off cellular radio (on a rooted device) using some command on ADB. My research only found that I should either (using GUI) enable Airplane Mode, or type some code to go to Phone Information and then tap Turn radio off.

But that's not how I want to do it.

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  I'm looking for a single or a set of commands to do the job here. (Note that I'm aware of using am start and input tap combination, but that's same as emulating the GUI.)

  
  



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  Also, in my OnePlus One (CM12), Airplane Mode as it seems only hides the Cellular icon. As soon as I disable the mode the signal reappears instantly, while signal takes bit longer when Turn radio (off -> on) is used?

  
  

  Any good reason for this?

  
  

Thank you! Your help would be appreciated.