Passengers on board the Malaysia Airlines flight turned back to Melbourne after a man made a bomb threat have spoken of their ordeal and the long wait for police to storm the plane.

The 15 years since 9/11 have seen more passengers offering their help during in-flight emergencies.

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Alleged would-be hijacker was released from psychiatric facility hours before boarding flight, police say.

Passengers overpowered a man carrying a large black box who was trying to enter the cockpit shortly after take-off.

A fourth terminal at Sydney Airport for international travellers that links to the existing domestic terminals are part of plans to handle strong passenger growth and a competing airport at Badgerys Creek in the city's west.

Around $620m has been wiped off the value of the parent company of British Airways as investors reacted to the catastrophic computer systems failure over the weekend that left thousands of passengers stranded.

A private jet once owned by Elvis Presley has been sold for more than half a million dollars after sitting on a runway in Roswell, New Mexico, for 35 years.

British Airways said it will try to operate most of its scheduled departures from London on Sunday, after a computer system failure paralysed its operations at the start of a three-day holiday weekend in Britain.

Relentless pressure on corporate America is creating an increasingly Dickensian experience for many consumers as companies focus on maximising profit.

A Jetstar plane started taxiing to the runway with a ground worker still attached to the A320.

"The dodgy tiger mascot who's got a squashed head" is making way for Toby, the real deal.

Tigerair will introduce the service with a limited number of $10 one-way fares for the inaugural flights.

The future of non-stop flights between Australia and Samoa is under a cloud.

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An airport passport control system has been restored after an earlier outage caused delays at international airports around Australia and New Zealand on Monday.

Man was subdued by passengers and duct-taped to his seat after allegedly trying to break into the cockpit of an American Airlines flight.

Singapore Airlines reduce number of flights from Canberra to Singapore.

Virgin Australia ran at a $69 million loss in the third quarter.

Authorities searching in the Bahamas for a small overdue plane with a prominent New York businesswoman and her two children on board, have reported finding a 'debris field'.

PM indicates Australia might consider the ban on some international flights.

Jetstar has started charging passengers to travel with babies on their laps during domestic and international flights.

Qantas' dominance of the local market and its profitable loyalty program have earned the airline a credit ratings upgrade from Moody's.

A fresh failure for the budget airline notorious for delays.

Qantas Airways' frequent flyer program has become one of its biggest success stories, with program earnings to double by 2022.

After months of fanfare, Qantas last week released the details of its non-stop flight from Perth to London aboard its new Dreamliner. And the loser is ... Melbourne.

Milan: Loss-making airline Alitalia, which asked to be put under special administration on Tuesday, had debts of around 3 billion euros ($A4.45 billion) as of February 28, Italy's government said.

Safety investigations will continue into Toll and Virgin Australia's turboprop aircraft.

Qantas has launched a new credit card promising more frequent flyer points at the same time as its loyalty scheme has helped power the airline's share price to an almost 10-year high.

Chicago Aviation Commissioner Ginger Evans apologized on Thursday for the city employees who forcibly removed a United Airlines passenger, an incident that prompted international condemnation and led the airline to revise its policies.

American Airlines' newest Boeing 737s will have less legroom in most of the economy cabin than current versions of the narrow-body plane, with at least three rows shrinking the space between seats to 74 centimetres.