Creepy Apple Calendar knows I'm flying. How?
I just opened my Apple Calendar app, and it knows the dates the departure and return date of my upcoming flight. I did not create this event in my Apple Calendar -- or any calendar -- nor do I even KEEP a digital calendar. The only place this information is currently located is in my gmail (airline receipt) and junk hotmail account (same airline receipt). I do not have this information stored elsewhere, to my knowledge. ...I am very guarded with personal information, and did not authorize any data-sharing, or otherwise. How does Apple Calendar know, what data is being shared (and with whom), and how do I disable?
MacBook Pro with Retina display, macOS High Sierra (10.13.3), Calendar and Privacy