The only time to believe the fuel gauges is when they show Empty !
Yep that's the only time they must be correct!
Avianca is a bit different as the never declared an emergency
91.3 is absolute and was one of the first provisions in the
Avigation Act of 1926 before then the post office told you when to fly ...and you flew or you were out, but with 91.3 came 91.13
...I, for the sake of learning, hope we'll get some more details
