HG 1/144 Delta Plus

The Delta Plus was a prototype Transformable Mobile Suit (TMS) developed by Anaheim Electronics. Based on the development plan of the MSN-001 Delta Gundam, the Delta Plus incorporated technologies from the Zeta series of mobile suits, as well as operating data from the MSN-00100 Hyaku Shiki. It was developed as an all-purpose attack machine, capable of operating both in space and in the atmosphere. Like the MSZ-006 Zeta Gundam, the Delta Plus was capable of transforming into a Wave Rider Mode with the ability to enter the atmosphere unassisted. The Wave Rider Mode's thrust was high enough to not only achieve atmospheric flight, but also serve as a Sub-Flight System for another mobile suit under 1G of gravity.

Lore excerpt from gundam.fandom.com.