Investigators into Alps crash find killer co-pilot Andreas Lubitz had 'hidden illness' from airline bosses
He had suffered from depression and 'burnout' and was once deemed 'unfliable' but was later passed as fit to fly
Head of Lufthansa admitted the 28-year-old had slipped through the 'safety net' - with devastating consequences
Friends said he was teased and called 'Tomato Andy' because he worked as a flight steward before qualifying
Police said they have found evidence of mental illness, but no suicide note at flat he is said to share with girlfriend
Germanwings pilot Andreas Lubitz tore up sick note for day he crashed jet | Daily Mail Online