What is PNR ? why will the ship not be able to turn back once it crosses the PNR?
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The point of no return (PNR or PONR) is the point beyond which one must continue on one's current course of action because turning back is dangerous, physically impossible or difficult, or prohibitively expensive. The point of no return can be a calculated point during a continuous action (such as in aviation). A particular irreversible action (such as setting off an explosion or signing a contract) can be a point of no return.
Explanation:
The phrase "point of no return" originated as a technical term in air navigation to refer to the point on a flight at which a plane is no longer capable of returning to the airfield from which it took off.
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