Seniority, bid group, bidding strategies.... just an illusion to make you feel like you've got a choice in the matter.
Rostering system is rife with manipulations (pre-assignments for training; management pilot cherry picking trips etc..) and constraints which prevent the software package from working as intended.
Best advice, don't expect the bidding system to always work the way you'd like it to work. Sometimes it's fantastic what can come out of the system, others.. just plain tragic, painful and fatiguing..
On the bright side, each roster delivery day is like a surprise party.... you can
keep discovering each and every month you are here..
SHR