My idea is that pre flight you get a option to plan your route also setting fuel/passengers/cargo. Would be cool if the map were you enter route would show winds and have a circle showing the range of aircraft with selected fuel/weight settings. As you start the flight you start with no fuel/passengers but press request fuel/ board passengers and your plane would fill up (has potential to be animated in future).
It could also potentially show estimated flight/arrival time which would be great for planning flights when you need to sleep.