Just curious to know, if an insider could describe what in-flight data airlines can retrieve and store in their 'extended' profiles of a FF account.

I just received two free tickets to a classical concert from one of my favored airlines, but I am absolutely sure I never actively told them about my fable for classical music.

Is this just a coincidence, or could they have retrieved the information maybe from some in-flight analysis where they monitor which movies you watch or to which music you listen?

I, for example, never switch the video on and only listen to music.