What would you choose?? Flight or driving? Please read explanation

My husband and I have a 3month old son. He is very calm and easy going. Rarely cries. Loves his carseat and loves looking at things. Sleeps for very long periods of time. I pump exclusively. My sister in laws parents can't make it to their vacation in South Carolina and are offering it to people for free since it's no re-fund(I think we'll end up offering to pay for some of the trip) and nobody can make it since it's such short notice. My husband and I look like we are able to. Question is -should we purchase plane tickets and take our son via plane or should we take a car trip? The car trip is 14hrs and we would go during our son's sleep time. We don't mind spending time in the car with some stops/taking a plane with an infant sounds a little scary to me/but taking a plane would give us a good chunk more time actually in south Carolina for the week trip. What would you do?? Thanks.

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