Aries OZ-07AMS (History of Gundam Wing)
The Aries is developed for aerial combat and capable of independent atmospheric flight thanks to the jet engines in its large, back-mounted flight unit. It adopts a simplified transformation system where it changes into flight mode by folding its legs into the thighs. Its wings have a number of hardpoints for mounting weapons, which can also be held in the Aries' hands. While the OZ-06MS Leo can be fitted with an optional flight unit, this is only suitable for a short distance and has inferior flight capabilities when compared to the Aries'. Outside of its flight capabilities, the Aries also has a faster speed and better weapons ability than the Leo. However, it has inferior power and armor capabilities.
https://gundam.fandom.com/wiki/OZ-07AMS_Aries