Lethal Skies Cheat Codes for Playstation 2

Alaska, Deep Strike: "S" rank:
Get a jet with a good FCS and equip only air to ground missiles. Fly through the canyon without destroying anything until you get to the enemy lab. Once there, destroy only the lab. If you make it in under three minutes, you will get an "S" rank for the mission.
Submitted by: SafMaster

Free flight mode missions
Get an "S" rank on a mission to unlock it in free flight mode.