No. Commercial airlines generally don't fly in the coffin corner. That's just asking for trouble. AF447 had nothing to do with the coffin corner - that acciden

No. Commercial airlines generally don't fly in the coffin corner. That's just asking for trouble. AF447 had nothing to do with the coffin corner - that accident was caused by the aircraft flying through icing conditions, the speed-sensing equipment icing over, the computer detecting that and switching the autopilot off and handing control over to the pilots, who then flew the aircraft into a stall and couldn't work out what they were doing wrong.