Drag while holding the right mouse button to look around in most views
Hold [Shift] while looking around to move the view up, down, left or right
Press a/A to adjust the simulation speed
Find frequencies of nearby ATC services nearby from the Radios dialog
Press v to change your viewpoint. Ctrl-V will return you to the cockpit
Press F3 to take a screenshot
Join the FlightGear community at http://forum.flightgear.org
Press h to bring up a Heads Up Display
Hide the menu bar by pressing F10
Frame-rate too low? Try disabling AI traffic
Fly in different weather. Select Environment->Weather
Press F12 to change the radio frequencies easily