Halo Reach Easter Egg - Four Banshees on the Package

Start the level "The Package," and at the very start with the two Ghosts, kill all the enemies and grab one of the Ghosts. Move the box underneath the balcony on the building far away from the building. Then drive over to the part with the scorpion, but don't enter it. You'll see a purple sniping nest. Go behind it off the ledge and there will be a switch there, activate it (hurry as you'll only have 10 seconds) and go back to the start. On the roof of the building you start behind will be four Banshees waiting to be flown.