Got curious about flights out of White Plains, NY. (Westchester County)
They have flights almost directly to you.
https://book.jetblue.com/B6/webqtrip.html;jsessionid=13BD29EEC4A99BF196EB757FF C4E4787?_flowExecutionKey=_cF9021708-9286-A3B0-9107-079293A66885_k0D7ED7C7-F943-CBCB-8D88-A67B87AC2EBA
Not sure how he would get to White Plains?
Also, Newark, NJ airport, might work for you as well. The train to NY also stops at Newark (next stop or 2nd stop after NYC). There is a train/light rail or bus that goes from Newark Penn Station to Newark airport.
Maybe he should just take the train all the way? By the time goes to the airport then sits for 90 minutes to 2hrs, takes off and lands and then goes from Atlanta to SC, it will probably be the same amount of time, maybe even less?
Just a thought.