Holding out.
A Squared said:
Just to muddy the waters further, I've been told (by co-workers who flew for that company) that another airline here has in thier GOM that *any* and *all* flights operating with no revenue cargo on board are Part 91 flights.
Would this hold up before the NTSB? I dunno.
It's an interesting question but please understand the bulk of this post is not directed at you. It's mostly for those new to commercial flying.
But I'd start with this question: When would it matter?
How about an instrument approach with the visibility below mins? Of course, Part 91 you can "take a look", Part 121 you can't pass the FAF.
So, hypothetically, Company ABC operates Flight 123 by "holding out" to the public. But on this day the public don't show up. It's a scheduled flight and departs as Flight 123. But on descent, while outside the FAF the vis drops below mins...
...see where I'm going with this?
If I'm gonna take a look I'm sure as hell not gonna be using my Flight 123 call sign. A Part 91 flight should be Part 91 all the way and be using its N-number as a call sign.
And just to expound a little on the topic of a flight release. A flight release doesn't make the flight a commercial flight. The concept of "holding out", the operating certificate and the OpSpecs make it a commercial flight.
The flight release is a document that serves to divide the responsibility for the operation of the aircraft between the PIC and the dispatcher.
Under 121 domestic rules dispatchers may cancel and delay flights and even declare emergencies when the flight crew is unable. They are every bit as much of the crew as the PIC, SIC and FE.