The pilots of the Spanair plane that crashed in Madrid, killing 154 people, failed to extend wing flaps needed to give the aircraft enough lift for take-off, a source familiar with the investigation said. Investigators believe both engines on the McDonnell Douglas MD-82 jet were working properly, according to the person, who spoke anonymously because Spanish authorities had not discussed the cause of the crash. Spanish investigators have declined to comment on the investigation into the August...