[PeterD]

These are new Mig-15 and F-86 (not the previous XP-86 or Rawner's Mig). You should install these after UI 1.2 is installed, but they are not the same planes as your previous ones.

In short, install these 'new' aircrafts only. If you also want to have your previous aircrafts (XP-86 and Rawner's Mig15), you have to install those aswell.