It just looks different. So it is cosmetic only. If I use ACE to add the winglets from the livery I am using at the time, I go to an exterior view and they are there. he same applies to removing them.

If you look in the CS_B757-200 folder, you will see two AIR files (cs757-200.AIR and cs757-200RR.AIR), so if only one 757-200 RR has winglets, and the rest don't, then there would be ore AIR files in their. Their are still going to be only those two AIR files.

Mark