The scenarios you're all talking about happen every day here at Pinnacle. Our days are regularly blocked at 7+59 and even 8+00 of flight, and go to 14 hours of duty. Add thunderstorms, in-flight holding, gate holding, ground stops, etc., or even in the winter in DTW you can sit for an hour waiting to de-ice on each outbound leg of a 5-leg day, and you can be assured that you will go over 8 hours just about every day of the week if the weather isn't CAVU.
Our company has some irrational views about rest and paragraph (g) which allows the "Legal to start, legal to finish" concept. It clearly states that it's about
FLIGHT TIME that was originally legal, not rest periods, but that's a whole different ball of wax. What follows is the definition that I personally have verified with our FAA POI, the Southeastern Region FAA Headquarters, and the Air Carrier Division of the FAA in Washington, D.C. (Oklahoma City doesn't govern the Air Carriers). If you like, I can provide names and phone numers for the people involved (I'm running a little crusade here against reduced rest abuse and the FAA is on my side instead of the company's - imagine that).
The person who mentioned Whitlow in this thread is correct; there is
NO circumstance in which you may leave the gate or, with ground delays, leave the ground knowing that you will go over 16 hours of duty. The "Legal to Start, Legal to Finish" concept does not apply to duty time.
Back to flight time: as long as a series of flights was
ORIGINALLY SCHEDULED for less than 8 hours between rest periods, you can fly 10, 11, or 12+ hours because of weather or mechanical delays (beyond the control of the carrier) and be absolutely, 100%, perfectly legal.
30 in 7 and 100 in a month concepts are the same way. The FAA considers you "Legal to Start, Legal to Finish", on a day-by-day basis, meaning that as long as you start the last day
SCHEDULED to be within these
FLIGHT TIME LIMITATIONS, you are legal to finish
THE DAY. Even if on day two of a four-day trip it becomes clear that you're
SCHEDULED to go over on day 4, you're allowed to continue right up to the beginning of day 4, in case you make up some time somewhere.
This happens every day here - you block over by 15 minutes somewhere on day 2 when the 4 day trip was projected at 29:52... you fly the trip up to the last day then call up and find out what leg they're going to drop to make you legal.
If you're really smart, you wait until the very last out-and-back (turn) in hopes that they won't catch it, then call them up and say, "I'm sorry, I just realized I'm not legal for this last turn. Have a great weekend, buh-bye." This way, which leg they drop is on your terms, not theirs, and they were going to have to use someone else anyway so it doesn't cause a staffing issue.
Last thought on the flying over 8 deal... make sure you get the additional rest and/or the reduced/compensatory rest that you are entitled to that night if the total planned flying within a 24 hour period for the next day's legs takes you into the next rest "bracket" (less than 8, 8-9, or more than 9 of scheduled flying). This is what our issue with our company is that I'm working on.
Fly Safe,,,