scott turow's airline preference

A couple weeks ago I was at a book signing. Scott Turow just released a new novel (Identical). Anyway, he started off by taking about his experiences on book tours, including noting his two rules for air travel:

• Never let go of your luggage
• Never fly United

I don't know what experience caused him to feel that way about United -- I haven't had any experiences with them that stood out in my mind. Certainly nothing egregious. But when he said that, I was reminded of the following: