Capacity vs Block Hours:
Measuring capacity (EASK Equivalent Seat Kilometers) to account for flying share hurts us when JV capacity is reduced. For every AF A380 cut, Delta cut nearly three (2.8) 767ERs to keep the percentage even.
But wait, not only has the JV cut capacity across the Atlantic, but Delta is flying less than the required share of the reduced flying. In short we got hit with a double whammy.

As the European economy rebounds we are looking much better. With added capacity the existing agreement disproportionately favors Delta pilots. For every AF A380 route added, Delta must add nearly three (2.8) 767ER or two A330 routes to maintain the same share. With Delta averaging less than our minimum share, the flying increase to match must be even larger. We stand to gain exponential international flying.
By switching to Aircraft Block Hours now we will fail to capture that increase but lock in the disproportionate hit we have taken so far.

Cheers
George