Boosted gravity propulsion drive

Boosted Gravity Propulsion Drive is the boost that is put onto Covenant vehicles such as the Banshee, the Ghost, the Wraith, the Spectre and the Shadow on Halo 2 and Halo 3.The Boosted Bravity Propulsion Drive boosts the vehicle into the air, it is not currently known how this device makes the vehicle "levitate".

Some vehicles also have an anti-gravity field, such as the Ghost or Spectre, which is believed to be related to the boosted gravity propulsion drive as it has to do with gravity.