Suspended Pelican
From Halopedia, the Halo wiki
It is possible to see a Pelican dropship suspended in mid-air on the level, Metropolis.
Directions
Play through the level Metropolis until two Pelican dropships arrive, this is right before you meet Corporal Perez. Walk into the building but do not follow the Corporal, once the screen says "Loading... done." walk back outside and look above the building. A Pelican with an attached Scorpion Tank will be frozen in mid-air.
