The only time fuel is dumped by aircraft is during an emergency and either 1) needs to land somewhere unexpected and is far overweight for the runway, or 2) there is a situation where the landing is exceedingly dangerous and there’s a need to reduce weight and potential fireball size (e.g. landing gear failures).
The only time fuel is dumped by aircraft is during an emergency and either 1) needs to land somewhere unexpected and is far overweight for the runway, or 2) there is a situation where the landing is exceedingly dangerous and there’s a need to reduce weight and potential fireball size (e.g. landing gear failures).