The trail of a jet plane is circular (both for an observer standing on the ground and for a pilot of a passenger plane flying by).

The trail of a jet plane is circular (both for an observer standing on the ground and for a pilot of a passenger plane flying by). Does this mean that the trajectory of the jet plane is a circle and in the “passenger plane” frame of reference?

No, Hint. In the “Passenger Airplane” frame of reference, the fog forming the trail of the jet plane is moving.

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