A shortage of air traffic controllers caused flight cancellations and delays at Sydney Airport, the federal agency responsible for managing Australia's air traffic said, as probes continue into several recent near-misses at the airport ↧ Sydney Airport flights disrupted due to air traffic controller shor... A shortage of air traffic controllers caused flight cancellations and delays at Sydney Airport on Friday morning, the federal agency responsible for ​managing Australia's air traffic said, as probes continue into several recent near-misses ‌at the airport.