You're close... unforeseen delays (such as an ATC delay, WX enroute, etc.) do not require an extension, and therefore no PIC concurrence.
(Caveat - unless the last leg of a duty day is delayed after signing the "fit for duty" block certification. This also requires coordination with the company. (117.19)
Also, the PIC can be investigated if he refuses to accept an FDP extension. 117 provides no protection from such.
http://www3.alpa.org/portals/alpa/co...amsters357.pdf
Originally Posted by
DownInPetaluma
Endeavor pilots are saying 'THEY WERE EXTENDED'
No one is ever 'extended'; it is at the discretion of the crew. You extend yourself, the company does not extend you.