Is climate activist Greta Thunberg sailing to the UN Climate Summit in her solar powered multi-million $$ racing yacht really helping?

Wouldn't her carbon footprint be less if she took a commercial flight that was going there anyway with an empty seat?

https://www.cbsnews.com/news/greta-thunberg-trump-16-year-old-climate-activist-says-meeting-with-president-would-be-a-waste/
Update: I understand now. Questions that are not blindly supportive of anthropogenic climate change are moved to Abuse and Spam by Level 7 dogmatic professional grad students.
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