similar round-trip flights like the Cardiff/Anglesey route where, presumably, it would be easier, (although not necessarily cheaper) to refuel at CWL rather than at the RAF Valley airbase. As a passenger I'd just like to know if there are some legs flown on full tanks and others where there's - just maybe - less of a margin.
Sounds a very specific example you suggest, ulterior motive maybe?
FYI it is just as easy to fuel in Valley as CWL.