Every blind line on the 747 has a seeded trip. This means that each blind line has a reasonable trip pre allocated to it i.e a CPT, SFO, LAS, PHX. These are 4 day 3 crew trips with at least 2 days off afterwards.
Not true, there are seeded blind lines but there are also a fair number of genuine blind lines. the seeds tend to go, not to the bottom, but to the middle level of seniority as they are too good a clashing tool to ignore. that said the destruction of BLRs being carried out under the auspices of the current BACC chairman has nullified that to some extent.