From the Flying page you can get an estimated time of arrival (ETA) of the aircraft.
Select an aircraft which is currently active, click the ETA button, and then right click on the map to get an estimated time of arrival of the aircraft. You also get a distance from the last point to the destination. If you need to move the ETA location at any time, simply click and hold on the ETA box and drag it around. To remove the ETA box, simply click on the ETA button in the points of interest again.