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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.
Most people will be too busy with their laptops, tablets, and phones to pay any attention to whatever ads they put on those screens.
So it’s okay then.
It certainly wouldn't be OK for anyone that actually wants to use the in flight entertainment. I watch whatever TV shows and movies that I downloaded ad free and never turn on the seat back screens.