Hola Mutt /
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I dont know of any US 121 operator that has a waiver to reduce the 10% time reserve for flights from A to B... Here in Argentina, essentially, we also use the 121 rules, and the 10% time reserve as well. What we often do, is to re-release during flight, thereby giving us extra available payload if required. I assume you have re-release as well with JAA/CAA rules... When I used to be with PanAm, with did a lot of re-releases on Atlantic flights Westbound, using YQX, then BGR for JFK as destination... 2 re-releases...
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One thing we do in Argentina, is to waive the fuel to alternate, if the destination has 2 or more runways, and TAF 1 hrs before/1 hrs after ETA is going to be 300 meters ceiling and 5 km visibilty or better.
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Do you know anyone that flies a 747-200 like the ones I fly, to compare the JAA fuel requirements with the ones I would have...? I do not remember, but I think JAA requires 8% time reserve... ??? Very little savings...
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Happy contrails