The X-Plane 11.05 public beta is now available for Steam customers on the public beta channel (check the settings for X-Plane betas in your Steam client if you want to join or leave beta).
The 11.05 update brings 1254 updated airports and 102 completely new airports to the X-Plane global scenery, courtesy of all the artists who use the scenery gateway. To learn more about airport scenery for X-Plane, check out http://gateway.x-plane.com/
This update also includes the first city to receive landmark scenery, fabulous Las Vegas. Check out the new Las Vegas McCarran (KLAS) airport and take off for a flight along The Strip.
For a complete list of all airports and other changes in this beta, see http://www.x-plane.com/kb/x-plane-11-05-release-notes/