Australian Transport Safety Bureau investigating staffing gaps as key factor in four incidents in July and AugustFollow our Australia news live blog for latest updatesGet our breaking news email, free app or daily news podcastModelling by Sydney airport’s air traffic control operators predicted elevated fatigue risks for staff at the time of a series of major safety incidents, with a review identifying runway incursions and near misses at 20% above national averages.Staffing gaps at Sydney air