The way I see it, news is polarizing. At their homes, if they watch news, they'll either watch CNN or Fox but they won't watch the other because it's offensive to them.

If these networks have agreements with the airports to broadcast at the gates, I understand.

Maybe they could be compelled to produce more unoffensive material specifically geared to the broader public you find at airport gates. A broadcast different then you would get from the cable broadcasts at their homes (that they control).

If we censor airplane crash scenes from onboard movies because they are upsetting to passengers, why wouldn't it make sense to censor partisan news broadcasts that are offensive and upsetting to half the pax?

It would just be a practical reaction to the evoution of media.