The J lines we had in CLT were on I believe B4 & 6, the aircraft entered the leadline straight in, then it would have a sharp left turn followed by a sharp right turn stopping the aircraft at a different angle then when it first entered the lead line. If you have google earth, bring up the B4/6 area and use the historical slider, there is a certain date in 2009 where you can see the how the leadline comes in straight but the aircraft is not at the same angle as the beginning of the line. It was put in to jockey around wing tips....