Originally Posted by gollum

Enjoy that 16 hours then. I wish we had it sometimes.

Yes you are correct that under that scenario you would exceed the 20 hours in 48 hours under sections 513,521,523,525 but the 20 hours is not a limitation. It only requires that you have additional rest afterwards. So you could do HNL-LAX-HNL, 14 hours rest, HNL-LAX-HNL and be perfectly legal, but would then require 18 hours rest after the second one before you could fly again. Of course then you would only be able to do one more leg because you would then exceed the 24 hours in 72.

It's also interesting to note that they use different language in 503 vs the restrictions under 513,521,523,525 which instead of using "flown" they state "aloft as a crew member". Not sure why the distinction but it's interesting one.