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DOHA: Two years ago, dozens of Airbus A380s set course for storage in sites from rural France to the Gulf as the outbreak of COVID-19 accelerated the demise of the world's largest jets.

Now, the iconic European double-decker is gaining a new lease on life as airlines scramble to cope with rising demand and shortages of newer models, though for how long is unclear.

The return of the four-engine behemoth at carriers such as Singapore Airlines and Qantas Airways QAN.AX - and soon at Japan's ANA Holdings 9202.T and South Korea's Asiana Airlines 020560.KS - comes despite high fuel prices that make operating new-generation two-engine widebodies far cheaper.

"Passengers, they love the plane and we have a lot of business class seats on it so it is a very good aircraft to fly on high-demand routes," Korean Air Lines 003490.KS Chief Executive Walter Cho said on the sidelines of an airline industry gathering in Doha.

Korean Air plans to have three of its 10 A380s back in service by the end of the year, up from one today.

Strong demand and delays in deliveries of new Boeing BA.N 777X airliners have also forced a rethink at Lufthansa LHAG.DE.

It will decide soon whether to bring back the A380, but has only 14 pilots with current approval to fly them and will train A350 pilots to double up, Chief Executive Carsten Spohr said.

The A380 was once billed by Airbus as a 21st-century cruiseliner with prospects for 1,000 planes in service. But only 242 were built after many carriers opted for smaller twin-jets.

Analysts say the fleet will never return to pre-pandemic levels.

Yet 106 are back in service, according to data firm Cirium, up from a low of just four when the crisis hit in April 2020.

There is little second-hand demand for A380s, so airlines often face a choice of flying or scrapping them.

"Keeping aircraft that have been written down... may be the least worst option," said Ascend by Cirium Global Head of Consultancy Rob Morris.

Even so, Air France permanently retired its A380s during the pandemic, Thai Airways THAI.BK and Malaysia Airlines have put them up for sale despite weak demand from buyers and even current operators have sent some to be scrapped.

'YOU WILL REGRET IT'

The downturn prompted many airlines to write down the value of their biggest jets.

Having taken that hit, they can fly the jet without expensive depreciation charges - though the price of fuel devoured by the plane's four engines remains a huge headache.

Qantas took a A$1.43 billion ($995 million) charge in 2020, mainly on the then-grounded A380, but is now bringing back 10 out of 12.

The A380 has also won a reprieve in part because airlines do not yet have enough demand to resume multiple flights on routes like Dubai-London, Singapore-Mumbai and Sydney-Los Angeles.