Originally Posted by KnotSoFast

.
Are you certain that's always the case?

I fly RDU/PIT-CDG and PHL-LHR sometimes. We have no ER pilot base there, so I bet those would be ripe for VB assignments. My base does not have those trips every day...some days of the month the pilots for those flights come from at least 2 other ER bases. I have even flown transoceanic trips out of other ER pilot bases.

The "out-base" flying is decided by the rotation construction algorithm, not necessarily from where the trip originates. I believe its' primary goal in generating rotations is to minimize credit time. And the above examples seem to change from month to month, never a static base flying them.

So I doubt you could sustain your argument that the block hours would always come from the same base, since the bases doing specific flying seem to change so much.
.