I'm not sure it would be an extradition, as that term is usually used. An extradition is where the governor of one state asks the governor of another state to turn a prisoner over to them to face charges in their state.
Things work a little different in air travel since it may be impossible to prove where he was actually located at the time the "crime" allegedly took place. Therefore, if the flight started in GA then the groping took place somewhere in the air, GA my abe the state that has original jurisdiction.
So, in short, it may be that they are transferring him but it is not actually an extradition.
It is unlikely that the ACLU or the LBGT groups will get involved at this point so you would likely be better off if you would actually go ahead and hire a lawyer that does criminal defense in federal court. If your grandson is in NY then you would want to hire one in NY to oppose whatever they are doing but you would have to hire a different one GA if he is transferred there.
You can find a lawyer to assist you by going to www.lawyers.com and in the section for Area of Practice enter Criminal Law.
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Of course, please feel free to ask any follow up questions in this thread. I want to be sure that all of your questions are answered.