A fighter pilot wearing a helmet on the background of a flying planeA fighter pilot wearing a helmet on the background of a flying plane
A helmeted pilot sits in the cockpit of a black planeA helmeted pilot sits in the cockpit of a black plane
The pilot is gaining the speed of a single-seat aircraftThe pilot is gaining the speed of a single-seat aircraft
On a dark gray blackboard, many mathematical formulas are written in chalkOn a dark gray blackboard, many mathematical formulas are written in chalk