“The Flight Attendant,” based on the 2018 Chris Bohjalian novel of the same name, debuted on HBO Max in late November with the first three episodes available immediately. “Supernatural” co-creator Steve Yockey serves as showrunner, and the miniseries stars Kaley Cuoco (“The Big Bang Theory”) as Cassie Bowden, Michiel Huisman (“The Haunting of Hill House”)...