I suppose it might be worth pointing out, here, that when it comes to fuel "dumping" (or jettison) capability, not every commercial airliner
has that ability.
You will find it usually only on the larger airplanes, generally if it's a wide-body (more than one aisle in the passenger cabin is a guide), then it is an airplane designed with a wider range of maximum takeoff weights compared to maximum landing weights (since these airplanes are designed for more long-haul flight segments, hence more fuel capacity).
Example, although the B757 and B767 share a common type rating for pilots, due to certain systems commonality, the B757 (single aisle, "narrow body") does not usually have a fuel jettison system installed. Although, it was an option for those purchasing it, when it was in active production.