Update (11:20 am ET): Boeing shares are extending losses (down over 6%) after France, Ireland, Germany, Iceland, and Turkey join the growing group of nations that are grounding 737 Max 8s.

Update (10:05 am ET): President Trump - now an aeronautics expert - has decided to chip in with some comments regarding Boeing's bans: "Airplanes are becoming far too complex to fly. Pilots are no longer needed, but rather computer scientists from MIT...often old and simpler is far better"