The reason for the desparity is that we have "some" retreads that have a Hong Kong roster on the freighter. That means that they mostly do the HKG-ANC sectors leaving a lot of the NA captains to mostly just go up to ANC and then back and forth between the various NA ports. THat involves a lot more days worked to accomplish teh same amount of flying. Throw in the fact that the freighter roster is a bit unstable to begin with, and voila.