The "media network" is https://kinectivemedia.com/ and they have a link for US customers to opt out that leads to here https://uniteddigital.iad1.qualtrics.com/jfe/form/SV_88OQmAbr20oeHn8 but of course you're going to want to also read Qualtrics privacy policy before using their services https://www.qualtrics.com/privacy-statement/

Clicking https://kinectivemedia.com/ privacy policy links to https://www.united.com/en/us/fly/customer-data-privacy-policy.html

They collect the usual stuff you use for travel like name, address, payment details, biometrics, I.D etc and also

Information collected in your use of our mobile application(s) includes, but is not limited to:

• With your consent, your pinpointed physical location information from technologies like GPS, Wi-Fi, or cell tower proximity (geo-location tracking)

• With your consent, while at or near certain airports in the U.S., your pinpointed physical location will be tracked continuously to provide you location-based offers, services and other information. For more information, see the Location Services FAQ located on the side menu of the United App;

• Your domain name;

• Device ID or alternative ID where required by the platform provider;

• Electronic data concerning operating systems and computing devices/browser, including types;

• Features you use and links you click;

• Amount of time spent in the application;

• Installs and uninstalls;

• Transaction details and history.

We may combine this information with information that we already have collected about you.

We collect information about you from third parties. If you make a reservation through a travel agent, we will obtain your travel information from that agent. We may also obtain information about you from our marketing partners, advertisers and other third parties.

We primarily use your information, including personal information, to provide our services to you and to fulfill your requests. In certain circumstances, such as for advertising purposes, we combine your information with other information that we have about you, that is publicly available and/or that we have obtained from third parties (either individually or in the aggregate)

We also use your information for the following purposes:

For marketing and advertising. United uses your information, consistent with applicable law, individually, in the aggregate, and/or combined with demographic information that we maintain or collect from third parties, for marketing and advertising purposes (via email, direct mail, telephone, web or other electronic advertising) and to send you news and newsletters. Specifically, information that we collect about you may be used to send you email, direct mail, or telephone communications about offers from United, its partners or other third parties, that might be of interest to you (please see the section on Disclosing your information below and the section on Changing your marketing preferences below). We also use your information to determine appropriate advertising channels and venues and to place ads on such channels and venues, including placing advertising on social networking sites.

I'm sure the money they make from this will subsidies flight costs that will be passed on to the end user for cheaper flight!