Halo: Reach Cheats[ XBOX 360 ]
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Glitch - How to fly the falcon on Winter Contigency
step 1: start the level on normal difficulty from rally point alpha.
step 2: the level goes on normally until you reach the first structure
step 3: kill a grunt to get a plasma pistol
step 4: overload the plasma pistol on the falcon dropping the warthog, so that the falcon will crash on the ground
step 5: get in! WARNING: once you get in, you won't be able to get out unless you restart!!!
hope it helps!