"FAR 25.1001 — Requires a fuel jettison system unless it can be shown that the airplane meets the climb requirements of FAR 25.119 and 25.121(d) at maximum takeoff weight, less the actual or computed weight of fuel necessary for a 15-minute flight comprising a takeoff, go-around, and landing at the airport of departure.
To comply with FAR 25.1001, the 747 and MD-11, for example, require a fuel jettison system. Some models, such as the 777 and some 767 airplanes have a fuel jettison system installed, but it is not required by FAR. Other models such as the DC-9, 717, 737, 757, and MD-80/90 do not require, or do not have, a fuel jettison system based on compliance with FAR Part 25.119 and 25.121(d). "
If I am not mistaken similar statement as above goes with Airbus aircraft.
Since DC-9, 717, 737, 757, and MD-80/90 are not fitted with fuel jettison system, does it mean that these aircraft will not suffer performance loss (payload loss) regarding FAR 25.119 and FAR 25.121(d) when these airplanes are operating?