How much extra fuel do aircraft land with

Does anyone know how many extra pounds or gallons an aircraft like a 777 or 74 or A380 land with

Maybe just enough to make it to a diversion airport! I don’t know for sure.

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Min by law is 30 min holding which is around 5000kg for the A380. If all goes well you will have the alternate fuel on top of this. Depending how far the alternate is 10.000-18.000 kg.

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Slightly different for countries etc, but similar to; enough to fly to destination, enough to fly to a pre-designated nearby diversion airport + 30-45mins of extra