Harry Potter readers are everywhere.
There were dozens on the plane, of course, many happily reading through the night. (I got a few open seats next to me and slept more comfortably than usual; thanks for asking.)
The reader I'll always remember though is the man, standing with his foot on the guard rail, next to his broken down vehicle on the shoulder of the M5, nose buried in the book.
My attention wandered somewhere in the second volume, but I'm pulling for you Harry!