Passengers on a Boeing 737 Max-8 plane during a United Airlines flight departing from Newark Liberty International Airport (EWR) in Newark, New Jersey, US, on Wednesday, March 13, 2024.Now playing on United Airlines' seatback screens: personalized ads.The carrier on Friday said it launched a media platform to serve travelers personalized advertisements on seatback screens and in its app, among other platforms, as it seeks to leverage customer data.United said its new platform, Kinective Media, is already wo ...