H solo
If the company has done their best, something beyond their control has messed things up and you feel it is safe for yourself and the rest of the crew to extend your duty period then discretion is a possibility. It should not be used simply to paper over the cracks in the companys poor planning. If it is patently obvious from the outset that things are not going to work (unrealistic planned block times, unrealistic turnaround times) then it's not my job to start aligning the holes in the swiss cheese for them by going into discretion.
Well said. A certain loco's winter schedule includes a six sector day rostered to within 5 minutes of max FDP and with totally silly flight and turn round times. That is NOT what it's for