This question isn't in the news, it's just something I'm wondering about.Is there anything suspicious about the "All right. Good night." comment from the co-pilot? I am ignorant of these things, but it doesn't sound like something a pilot would say. Ever. Shouldn't there be a call-sign involved? Perhaps it was a comment from another person on the same frequency? Perhaps it was an earlier recording of the copilot, maybe talking to his wife on his cellphone, taken by the pilot and played back for the purpose of confusing an investigation?