What would you do if people started singing Christian songs on a plane?

Here is an article with video of an incident on a flight in the US yesterday.

Ironically, I would loudly protest to a flight attendant. I want a flight to be as calm as possible, and that includes being quiet. Or maybe I would put in earbuds and try to listen to the music provided by the airline. I don’t carry playlists on my devices.

If I am captive in a plane for an extended period, I have paid for my space. A person preaching to me is invading my space. I believe that singing religious songs is akin to preaching.

Is free speech involved here?

What are your thoughts?