Thanks for educating me. I do stand corrected. Comms were scratchy on your first transmission."Radio" is something you talk on to people outside the aircraft and is an object that FOs have been allowed to use at pretty much every carrier since the dedicated radio operator left cockpits.
"PA" is something you use to talk to the people in the cabin. It is something that at some carriers the captain is responsible for using, while at other places both the captain and the FO use depending on what is happening.
Thanks for coming to my Ted Talk.
...Good Ted Talk!

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