we understand many of them have gone home. all of them waking up to the grim reality that this recovery process continues and that their loved ones have yet to be identified. christine. erin thank you for that. the ability of the co- pilot andreas lubitz to lock the pilot out of the cockpit is raising concerns of the policies of lufthansa which owns germanwings. our correspondent frederik pleitgen spoke with the lufthansa ceo carsten spohr. he asked about the policy of a pilot being alone in the cockpit. in the united states, for instance if one of the crew members leaves the cockpit, there has to be someone who goes in. a flight attendant or something. why was the co- pilot allowed to be in the cockpit alone? also in the united states to my knowledge, that is true for few airlines. most airlines follow the same procedures at lufthansa. in flight faces low workload a