My guess would be that they financed their outfit via some financial instrument which has a covenant that includes Global to operate some kind of wetlease by the end of the year. So Surinam Air is probably wetleasing the HiFly aircraft via Global using an ACMI contract. Remember Global was trying to get stakeholders earlier this year after rebranding into an ACMI business.

https://aviationweek.com/air-transpo...lobal-airlines