You should use the aerodynamic surfaces (elevators, rudders, ailerons) while in the atmosphere when flying the DeltaGlider or Space Shuttle.
Use the numeric keypad (if you have it) to control them. On the DeltaGlider, you may have to activate it with the AF CTRL -> ON to the left on the 2D panel.
If you don't have a numeric keypad, you can remap the keys to the ones you have by editing the keymap.cfg file in your root Orbiter folder.
See the RCSPitchUp etc. entries on line 37-48.
My setup is like this:
Code:
RCSPitchUp = S
RCSPitchDown = W
RCSYawLeft = A
RCSYawRight = D
RCSBankLeft = Q
RCSBankRight = E
RCSUp = S
RCSDown = W
RCSLeft = A
RCSRight = D
RCSForward = E
RCSBack = Q
This way, pitch and yaw are on the WASD keys, roll/bank on Q and E.
Similarly, the RCSUp etc. control the linear RCS.