Flyable Pelican and Phantom
From Halopedia, the Halo wiki
This Easter Egg on Halo: Reach permits the player, abide after performing the following tasks, to pilot the Pelican and Phantom. This can be found on the Hale: Reach level New Alexandria.
Walkthrough
First complete all tasks assigned until you must return to the ONI Headquarters. Fly to the tower with Club Errera (It will have an orange rectangle on the top of the tower, look high) and approach the tower to the left of Club Errera while looking at the front of it. On the other side should be a hollow area with a ceiling but no floor whatsoever. Once all the mission objectives prior to the ONI Headquarters are completed, a switch should be on the ceiling. The player must toggle it before the next step. This possible to do on Solo and requires at least two people on Co-Op.
First, one player stands on top of one Falcon, the pilot must then carefully hover into the hollow area in the back of the tower and adjust the player height until they can activate the switch. This easier done of the player has a jetpack which is obtainable behind the jammer in the Hospital segment of the mission. After activating the switch, you must fly through the oval ring in the tower that resembles the Shanghai World Financial Center.[1] At this point, if the player is in a Falcon or Banshee, they will be transformed into a Pelican or Phantom respectively. A video walkthrough can be found here.[2]
Both vehicles are operated by using A to ascend and LB to descend. The Pelican can pick up passengers in the back by holding RB (Although the indicator is not shown, it will still work). The chin gun can also be operated by a player that holds RB near the chin turret. They will have full motion and firing abilities but cannot see anything because of camera placement. If the pilot exits the vehicle, it will disappear.
Also note that if there are any passengers or gunners inside the Falcon during transformation, they will remain in the vehicle as it falls down. If the party leader is a passenger in the Falcon then they will get a Pelican first.
