4 red lights over the Atlantic Ocean

My brother and I (along with his wife and 3 kids) were on the boardwalk in Myrtle Beach when we both saw 4 red lights in a horizontal line over the Atlantic Ocean. It was pitch black over the water, they were high above the horizon. They appeared to be either very small or very far out. They were all lit up, then went out, one by one in a line. We didn’t see them again. We were the only two who saw it and didn’t realize we were both seeing it at the same time until my brother said something. Unfortunately it happened too quickly to get a photo or video. It all happened within a few seconds.