As a former Microsoft employee, “flighting” is the internal (and external, in some cases like https://learn.microsoft.com/en-us/windows-insider/flighting https:

As a former Microsoft employee, “flighting” is the internal (and external, in some cases like https://learn.microsoft.com/en-us/windows-insider/flighting https://learn.microsoft.com/en-us/windows-insider/flighting) name for A/B testing or feature flags and has been for a long time. If that was the original definition from whoever introduced it to the company, it’s long been forgotten.