Press control-e first and hear the low double beep before typing codes in: 
battlecheat = enable in-flight cheats
canttouchthis = invincibility
fillerup = unlimited flight range
knowitall = all research is yours
quickbase = finishes all bases currently under construction
payday = money



Fly All Ships
To do this trick, you have to go into Windows Explorer or whatever it is you 
use to look at all your computer files. Go to your Alliance folder and look for 
a docment called 'shiplist'. when you open it, it shows you ship names, 
classes, etc. Near the end of the line, you'll see either the word flyable, or 
non-flyable. To add a ship to the flyable list, just type in flyable in the 
place of non-flyable. 
NOTE: With the larger ships like Star Destroyers and Cruisers, handling is 
EXTREMELY slow and the turrets don't work. Also, with any of the added ships, 
engine sounds don't work and sometimes cockpits don't show up. 

This next cheat only works with X-Wing Alliance v1.00! 
Press ESC during the game (favorably in the Concourse / aboard your Family 
Transporter). Go to the 'General Options'. At the bottom you can set the preset 
values for 'F11' and 'F12'. Now set the 'Beam Level' to Zero. 

Note: This only works when you don't have a Beam Weapon installed ! (tnx 2 LoX)
When flying press your new-edited F11-key (or F12 whatever) and you're in for a
surprise. The game seems to allocate energy for the Beam Weapon even if you 
don't have one installed - and since we set the Beam Recharge Level to Zero you 
are getting that energy added to your engines !!! 

This will give you an edge especially with the slower ships (e.g. Y-Wing, 
CORT's ...).