Lufthansa’s Spohr said there wasn’t “the slightest indication what might have led” to the Lubitz’s actions.
The second-in-command had passed all psychological tests required for training, Spohr told a press conference, insisting: “He was 100-percent airworthy”.
The search for clues saw investigators Thursday search Lubitz’s home as well as the flat he kept for work in the Germanwings hub of Duesseldorf.
– Changes to cockpit policy –
In the first industry responses to the disaster, Canada ordered its airlines to have two people in cockpits at all times, effective immediately.
Germany’s aviation association BDL announced plans Thursday to introduce a two-person cockpit rule, while British low-cost carrier easyJet, Scandinavia’s Norwegian Air Shuttle and Icelandair all made similar announcements.
Many US airlines already have such a policy in place.
The International Civil Aviation Organization, the United Nations world aviation body, called for regular mental and physical check-ups for pilots.