that is interesting how you both read 135.263 as it being ok to exceed flight time limits knowingly BEFORE departure. So, trap question, if I have 3 legs today with planned flight times of 9 hours total and upon landing on my second leg I have 10 hours on me, can I complete the third leg? Assume 2 pilot crew, unscheduled ops.
135.267(d) sets 14 hours of duty in stone. Notice there is no provisions for going over duty and the reg reads 10 hours of rest in the24 hours preceding the PLANNED completion of the assignment. The plan comes from the operator at either the beginning of your day or leg by leg. I duty on at 8am I have to be done by 10pm, that is the planned completion of the assignment.
Everything else under 135.263 talks about flight time, not duty period. The way, If I understand you two correctly, you guys are reading this, is: the operator can hold you on duty indefinitely as long as it is something unforseeable? Also you appear to be saying you can knowingly exceed flight time limits as long as the reason was unforseeable? By knowingly exceeding flight time limits I mean, you have 8 hours reschon you, the last leg is blocked for 2.1 hours but because of weather you have that 8 hours when you should have only 7. You are saying it is legal to depart?
I am assuming you have block times (I don't we have only our flight plan times), also assuming no reschedules and such. Just straight up, here's your flight assignments for the day and because of weather, etc the last leg will put you over duty or flight time AS BLOCKED.