Is Coke Kosher?

Dear Rabbi, I was sitting on a plane a while ago and saw an Orthodox Jew sitting next to me drinking Coke. Is Coke Kosher? I didn't see a Kosher symbol on it.

 

Are you a wondering Jew? There are always things we want to ask but for whatever reason we don't. Whether we're embarrassed or simply don't know someone we can ask. 

 

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