I do work for a large corporation, but don't really do business travel. I did get curious and asked someone on United chat, and they said it was because I had my TSA KTN assigned to my frequent flyer account. Which didn't make much sense to me... but oh well. My normal frequent traveler programs are Southwest A-List, Hertz Five Star and IHG Platinum Elite. I'm pretty 'basic' with every other program.