Movement:

Mouse move         - direction       Up arrow           - forward
Down arrow         - backward        Left arrow         - strafe left
Right arrow        - strafe right    Right Shift        - up
Right Ctrl         - fast down

Cruise control:

+                  - increase speed  -                  - decrease speed
*                  - max speed       /                  - stop

Targeting and firing:

Right mouse button - nearest target  Left mouse button  - gun fire
Enter              - fire missile    Net scroll         - select missile

Navigation & objectives:

N     - show current navpoint description, switch to the next navpoint
F12   - view mission objectives

Camera:

F4    - swtich camera view           F5                 - main view
F6    - full screen target           T                  - toggle target
U     - toggle cockpit devices