SP
How can you really claim the c/c rostering system is efficient with so many 24 hour availabilty days rostered immediately after MBT's with the following trip non-flexible which means the crew cannot be used on these availability days?
I realise a bidding system would be far more complex for the c/c because unlike the pilots the c/c fly on more than one aircraft type.
However other airlines manage to operate a c/c bidding system with multi aircraft types very effeciently, ask some of them and you will probably find the crew would not want to go back to the old fashioned rostered system you currently have.