Indonesia is investigating local carrier Batik Air after both pilots were found to have fallen asleep for 28 minutes mid-flight, BBC reported.
The two men - who have both been temporarily suspended - fell asleep during a flight on 25 January from Sulawesi to the capital Jakarta.
One of them was reportedly tired from helping care for his newborn twins.
The Airbus A320 briefly veered off course but landed safely, with all 153 passengers and crew members unharmed.
According to a report from the transport ministry, the 32-year-old pilot had told his co-pilot to take control of the aircraft about half an hour after take off, saying he needed to rest.
The 28-year-old co-pilot agreed, but the co-pilot inadvertently fell asleep as well. According to the report, his wife had just given birth to one-month-old twin babies and he was helping with childcare.
Jakarta air traffic control tried contacting the cockpit of the Batik Air A320 after their last recorded transmission but received no response.
That radio silence lasted 28 minutes until the lead pilot woke up and realised that his co-pilot had also fallen asleep. He also found that the aircraft had briefly veered off course.
The pilots then responded to calls from Jakarta and landed the plane safely.
In 2019, the same airline was forced to have an emergency landing after the pilot fainted.
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