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I believe for the satellites to pick you up you need ADS-B antenna diversity (an antenna on the top and bottom of the plane) which I don’t believe is very common yet because it has cost.

They're visible on Flightradar24. Look at the north Atlantic, there's usually several of them at any time. The satellite sourced data uses blue icons on the map.

That's not Aireon data but rather ADS-C which is just Iridium data link as far as i know.

No it's ADS-B receivers on satellites.

https://www.flightradar24.com/blog/satellite-based-ads-b-dat...

You can buy access to the data from FlightAware. I've never been in a position to see the pricing, though I'm sure it's expensive.