I guess some of you out there have been waiting for a "paper" that I was talking about in which I would cover the current events involving crew rest and fatigue.  I wanted to make it an easy download for you so here you are in PDF format.  Comment away. 121 Paper.pdf

Here is an excerpt of what you'll find:

Deducing from FAR 121.471, a pilot can log just shy of 8 hours of flight time while being on duty for a maximum of 16 hours straight as long as he/she gets 9 hours of rest. Most airlines institute a 14-hour duty day limitation, which can be extended to 16 hours due to inclement weather and mechanical delays. But in no instance shall a crew take a flight knowing well that they would violate the 16 hour regulation. At that point, your pilots usually advise you that they will need to re-crew the aircraft and flight in order to get you to your destination.