Australia's aviation safety authorities have opened an investigation into another near-miss involving commercial aircraft at Sydney Airport, marking the fourth reported close-call at the airport in less than a month.

The latest incident involved two Qantas aircraft — a departing Airbus A321 and an arriving Boeing 737 — which were directed toward the same ground intersection. The A321 subsequently braked to avoid a potential collision.

There was no collision, and the Australian Transport Safety Bureau said the incident is being investigated to determine whether broader or systemic factors contributed to the sequence of events.

The incident follows several other aviation safety events at Sydney Airport in recent weeks, including a July incident involving a Qantas 737 and Qantas Link Dash 8, as well as incidents involving Jetstar and Virgin Australia aircraft in August.

The repeated incidents have increased attention on air-traffic-control procedures, communication and operational safety at one of Australia's busiest airports.

The ATSB is expected to examine the circumstances surrounding the latest event, including the instructions provided to the aircraft and the factors that led both aircraft toward the same ground intersection.

A preliminary investigation report is expected within six to eight weeks.