A Qantas flight travelling from Melbourne to Dallas was forced to make an emergency diversion after a disruptive passenger allegedly bit a flight attendant during the journey.

Jetstar has rolled out one of its biggest sales of the year to mark its 22nd anniversary.

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.

Singapore-based budget airline Jetstar Asia will cease operations at the end of July, the company announced, citing mounting financial pressures.