The loss of Air France Flight 447 on 1 June 2009 near the mid-Atlantic Ridge killed all 228 passengers and crew.  The flight recorders have not been located, and the cause remains unexplained.  An interim update on the investigation is scheduled for release on 17 December.  Meanwhile, on 29 November a flight from Rio de Janeiro to Paris encountered severe turbulence in the same location before descending into calmer weather and safely completing its trip. The continuing mysteries prompt Cesare Marchetti and Jesse Ausubel to post some notes about a possible role for outgassing methane in the AF 447 crash which they accreted over the months after the tragic crash.