Qantas is cutting airfares on domestic flights despite sharply rising aviation fuel prices, as it seeks to boost bookings amid a broader decline in consumer sentiment.

All flights into and out of Fiji were cancelled or diverted on Tuesday as Tropical Cyclone Vaianu swept through parts of the South Pacific nation.

Australian airlines will ban the use of portable power banks on flights starting next month following several international incidents, including a mid-air fire on a Virgin Australia flight in July.