A Tigerair Australia Boeing 737-800 took off unpressurised after pilots incorrectly configured the cabin's air conditioning system prior to takeoff, an investigation has found.

Australia's Fair Work Commission has signed off on a new enterprise bargain agreement between Tigerair Australia and its pilots.

Virgin Australia returned to profitability in 2018/19 first half amid ongoing improvement in its domestic business and despite higher fuel costs.

Tigerair Australia says it has rescheduled a number of flights on Friday morning ahead of a planned four-hour work stoppage by the airline's pilots.