One more try to get you to understand. She hitched a ride on a sailboat. No extra carbon footprint. She did not affect the owner's subsequent crewing of that boat for it's future voyages.
Whereas I've thought deeply about your concept that flying standby on a plane means one has zero carbon footprint because the plane was going to fly nonetheless. Somehow magically only the prior booked passengers incur a carbon footprint, rather than all share. Ultimately I find it curious, but not convincing. Particularly, as I noted upthread, lifting the extra passenger does cost some 20 to 30 extra liters of fuel per 1000 kilometers.
Yes there is
She "chose" to use the fancy boat which meant either 5 flights or 6, rather than 4
She did affect it, because it wasn't going to NY with them on it.
In fact I don't think it was even going to NY, they just offered to take a massive trip as a favour, which she "chose" to use, presumably without asking how they were getting back
See this is called making things up someone hasn't said.
What I said was I am not going to feel guilty about it and that the plane would fly any way
I never said I make no carbon footprint
Your depth of thought was a tad shallow