Plain English Meaning
It is a way of teaching pilots to make decisions by changing the situation mid-flight on purpose, so the student has to think it through again and choose what to do next.
Full Definition
A teaching technique used in flight instruction where the instructor deliberately introduces realistic changes to the conditions of a planned flight — such as weather, aircraft performance, passenger needs, fuel state, or destination availability — so the student must reassess the situation and make a new decision based on the updated information.
Context Anchor
Seen in scenario-based flight training and instructor planning, especially when teaching pilot decision-making during a lesson.
Derivation
“Inflight” means during flight. “Scenario” comes from a word for a stage scene or planned situation. Together, the phrase points to changes inside a planned flight situation, not just a fixed script.