Sydney Airport is investigating a runway near miss involving a Qantas flight, according to multiple reports. The incident occurs when air traffic control clears a Qantas aircraft to cross a runway shortly after another aircraft has come in to land. After the clearance, control actions are taken to prevent both aircraft from operating on conflicting movements. The reports say air traffic control halts both aircraft, bringing their operations to a stop to address the potential safety risk. The event is described as a near miss rather than a collision, with no details in the provided accounts about injuries, damage, or the specific aircraft types. Authorities review air traffic control procedures and timing related to runway access and runway crossing to determine how the situation developed and what safeguards failed to prevent the unsafe proximity. The investigation is ongoing, and further information is expected from aviation safety processes and the relevant regulators.