Mammoth Freighters and Aspire MRO have successfully completed the fifth installation of a main deck cargo door on a Boeing 777 passenger-to-freighter (P2F) conversion, marking another key milestone in their expanding modification programme.
The Texas-based partnership now has seven Boeing 777 aircraft in various stages of production, reflecting accelerating momentum in response to strong market demand for widebody freighter capacity.
Scaling Up 777 Conversion Capabilities
The Mammoth 777-200LR and 777-300ER Special Freighter programmes are designed to extend the operational life of retired passenger aircraft while delivering modern, high-capacity cargo solutions for airlines and leasing companies worldwide.
Aspire MRO, based in Fort Worth, Texas, serves as Mammoth’s exclusive conversion partner, providing heavy maintenance, engineering, and modification services for the programme.
Industry Demand for Large Twinjet Freighters
With continued growth in global e-commerce and resilient demand for long-haul cargo capacity, large twinjet freighters like the Boeing 777 remain highly attractive to operators. The platform is valued for its high payload and extended range capabilities, making it one of the most versatile freighters in the market.
This latest achievement demonstrates Mammoth Freighters and Aspire MRO’s progress in scaling modification capacity to meet the rising needs of global carriers and lessors.

