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According to The Foundation for Aircraft Selection, airlines are bound by only two hard and fast rules when choosing flight identification numbers. Airlines cannot reuse the same flight number for flights departing from the same airport on the same day and flight identification numbers can have a maximum of four digits.
A plane might fly under the same flight number for the entire day even if it is flown multiple routes, but another plane that makes a stop in a hub or visits the same airport twice or more might have multiple flight numbers throughout the day.
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"I lit another cigarette. Unless I specifically inform you to the contrary, I am always lighting another cigarette." - from a novel by Martin Amis
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