v4.4.6 (29 May) has a couple more minor adjustments and bugfixes; the speed selector value won't automatically change anymore when the speed setting is already being changed by user.

v4.4.5 (18 May) contains several minor adjustments and bugfixes.

New in v4.4.4 (small update, 12 May 2021):

• Increased the maximum speed for planes at or above FL100 from 250KT to 300KT. Below FL100, the speed automatically reduces to 250KT, unless a speed has been assigned manually, in which case the plane's speed is maintained until the intercepting the localizer. Departures will automatically increase their speed above FL100 unless a speed has been manually assigned.
  
• For custom airports:
  • The FL100/250KT speed restriction can be adjusted (see 'speedrestriction' item in the example file).
    
  • Open-ended approach routes have their final heading drawn on screen.
    
  • Optionally, frequencies and atc names can be specified in the file, in order to get more realistic readbacks when handing off planes. See the newly added 'naming' and 'handoff' items in the [airspace] section, and also the extra runway property to add tower frequencies per runway.
    
  • Fixed issues with speed reduction on the ILS and level busts on approach routes.
• Added reminder on startup if a timer is enabled.
  

New in version 4.4 of Endless ATC (30 March 2021):

• Departures now have similar speed controls to arrivals.
  
• The tutorial mode will no longer trigger after a high score of 7.5+ has been reached.
  
• Added an end game button in the traffic menu. It simply allows you to close the airspace in one click; it switches to custom traffic with a skill of 0, and turns planes around that had not yet entered the controlled airspace. This also disables recording of high scores and goals until a new game is started, because it uses custom traffic mode.
  
• Added a timer option. This lets you determine in advance how long a play session should take. It solves the possible 'one more plane' problem that may occur due to the endlessly incoming new traffic (even though quiting is possible at any time because games are autosaved). In the new timer menu, you can set a certain amount of play time, and choose an action which will happen when the timer runs out. When no action is chosen, just a message will be displayed when the time is zero. But when the exit action is enabled, the game will simply save and exit automatically. The end game action closes the airspace, as described above, so you can land all remaining planes before you quit. Besides play time, the number of plane landings can also be used to trigger the action. Note that the timer remains enabled when switching airports/resetting traffic. When pausing, the play timer also pauses. Of course, the timer is only optional and disabled by default.
  
• The fullscreen toggle button is moved to the display menu. Alt+Enter is the quickest way to go fullscreen.
  
• Changes to custom airports (see the example.txt file for details):
  
  • Longpress the SID button to give a direct to the last point of the departure route.
    
  • Approach routes can be defined as open-ended instead of leading onto a localizer. When reaching the last waypoint, the plane continues on a heading, requiring vectors to the ILS.
    
  • Added option for custom airport pronunciation.
    
  • Added custom localizer speed property, to override the default 200KT restriction when intercepting the localizer.
  
  
• v4.4.1 fixes an issue that could happen when changing airports.

And for more variation, more than 20 detailed, user-generated custom airports are ready to be downloaded thanks to the community on GitHub and Discord. ːsteamhappyː