Airlines report flights booked directly to security agencies, including new, cancelled, and changed itineraries, with complete customer information. They don't need to hack airlines—the regulatory system has given them what they need.

https://papersplease.org/wp/2013/09/29/how-the-nsa-obtains-a...

For all we know, all major hotel chains could just be forced to comply with secret injunctions from FISA, and it would still be totally legal, and totally cool.