Dear Air Traffic Controllers， We have an update in our demo. [Change] [list] [*] Added new map KDCA: Reagan Washington National Airport. [*] Added a new airspace mechanic which only allows aircraft to pass the airspace from one side and not the other. [*] Added a new upgrade choice "NAVIGATION WAYPOINT". [*] Added new tutorials for "RESTRICTED AREA", "MOUNTAINS" and "GO AROUND". [/list] [Bugfix] [list] [*] Fixed some known aircraft control issues. [*] Fixed a bug where the manual time control is allowed when the upgrade panel is showing. [/list]