A captain and second officer on a 747-400 disagreed over the take-off calculations they should be punching into the passenger jet’s computer, Fairfax Media reports.
Qantas is investigating the dispute and has grounded the pilots.
The incident occurred on Tuesday night (US time) last week as a major thunderstorm rolled across Dallas, disrupting services at Dallas-Fort Worth International Airport.
As the pilots were close to exceeding their 20-hour duty limits due to delays caused by the weather, Qantas’s flight operations managers kept the jumbo on the ground overnight.
The managers, informed later about the dispute, stood down the pilots.