HG 1/144 Delta Kai

The final machine of Anaheim Electronics' Delta-type series, the Gundam Delta Kai is an enhanced version of the MSN-001A1 Delta Plus, which is used to demonstrate new experimental technologies that can be used for future mobile suits. As such, the unit is greatly overhauled from the regular Delta Plus, modifying both the MS and Waverider forms as well as enhancing its variable frame. Several thrusters were also fitted into the unit's legs and back skirt which allow the MS to fly in both space and under gravity, giving it a tremendous amount of speed and maneuverability. The Waverider mode can also function as a subflight system when needed.

Lore excerpt from gundam.fandom.com.