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United Airlines passengers to see targeted ads on seat-back screens
(www.cbsnews.com)
This is a most excellent place for technology news and articles.
Does united use the same in flight entertainment system as Delta? If united does they are probably tracking you using the facial detection camera on the seats.
No it's actually a facial recognition camera...
https://gizmodo.com/united-and-delta-cover-their-seatback-cameras-in-bid-to-1834381804
https://www.bizjournals.com/atlanta/news/2019/02/26/some-delta-flights-have-cameras-in-seat-back.html
https://www.dallasnews.com/business/local-companies/2019/02/24/american-delta-and-united-swear-they-ve-never-used-those-seatback-cameras-staring-at-you/
https://www.usatoday.com/story/travel/news/2019/03/01/some-airlines-have-cameras-installed-back-passengers-seats/3022742002/
I highly doubt that, the compute on these tablets is straight trash.