Lets say you have four legs to Durban and back from your base at OR Tambo. You complete your first leg on time but then you are delayed for a few hours in Durban. You return to your base at JHB and you realize that you will still be within FDP on your way to Durban but you will bust FDP on your way back to base. While sitting in aircraft at base waiting to depart can you start planning to use captain's discretion to return to your base?
(The crux of the question is whether or not you may plan from where you are at base station to return to base station knowing that you would need to use captain's discretion to return. Would you need a crew change?)
