Two guys who were licenced by the authorities, got into a plane which, performance wise, couldnt do anything near what it said on its tin - safely
The 747-400 is certified to fly at 45100 feet, yet I've never seen one that high nor flown one on which the FMC said it could achieve it. Does that mean the 744 is an unsafe aircraft? Come to think of it the A321 is certified up to about 39800 feet but with any sort of load it'll struggle to get above FL350. Is that aircraft unsafe too? There is a world of difference between what an aircraft is advertised as being able to do in extremis and what is feasible in reality and it is the crews responsibility to operate within the realms of the feasibly, not the theoretical.