They put more fuel in the planes than they can actually land with. If they don't use it up or eject the fuel it can cause a crash landing. That's my guess
Someone has not put their phone on airplane mode, the plane senses this and fears that a predator is nearby and does not dare to land. planes who have young are extra sensitive to this and will never land if they sense a predator, the airport personnel is most likely trying to show the plane that the ground is safe. But it’s not an easy job.
Mostly because 2 reasons:
Waiting slot, free lane, etc or the airplane is too heavy to land and its twrowing fuel away to become lighter.
Not a captain, cant fly away.
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