Give the guys and gals in crewing a break, unbeknownst to us there are lots things happening behind the scenes, as commercial dept is trying to rationalise what equipment flys where and when..(a good thing for GF) but many times this causes headaches for ops and of course ultimately us crews as well...as these sudden often daily changes occur, crewing has to react to them often with very little notice...throw in a few tech aircraft here and there, and a bit of sickness, and crew shortages, resignations, (the grass is greener syndrome) that already exist,...and you can imagine what crew control are up against..like "pissing out forest fires"... preferential bidding....funny you should mention that...strong rumour it's in the works...