X-Plane 11 Utility V115 Addit! Pro. For X-Plane 11 Addit! Pro is a comprehensive add-on manager for Laminar Researchs X-Plane 11. Easily install, manage and remove aircraft, liveries, scenery, libraries for scenery, plugins, flight plans, sounds, textures, videos and more! Automatically update and arrange X-Planes scenery library (scenerypacks. ini). A powerful aircraft editor lets you tweak your fleet, assign pictures to planes and panels, and even hide aircraft. Rearrange scenery layers, set priorities, and manage entries with the scenery library editor. Full-featured add-on management lets you import, archive, recreate, and remove add-ons. Check an add-ons health to reveal configuration problems and missing files. See Readme. htm for details. Requires X-Plane 11 by Laminar Research. By Joseph Stearns.