By Robert Wall 

LONDON--Falling oil prices promise lower fuel costs for many of the world's airlines. They also may give older jets a new lease on life.

Many airlines have raced in recent years to buy new, fuel-efficient jets to cut down on fuel bills-which typically make up about 30% of an airline's operating costs. Amid today's falling oil prices, there's suddenly less urgency to do that.

Air France-KLM SA has previously said it may delay adding new planes to cut capital expenditure amid its deteriorating financial outlook. Late Thursday, it said that lower oil prices may make that easier to do because it makes their existing, older planes competitive again.

The International Air Transport Association said earlier this month that it had raised its 2014 collective industry profit forecast to $19.9 billion, up from $18 billion because of the benefit expected from lower fuel costs. Profits should rise further next year to $25 billion.

The industry's fuel bill this year could end up 2.4% below last year's level, the IATA estimates, and it is set to fall another 5.6% in 2015. That's despite forecasts that carriers will fly more and increase total consumption.

Not all airlines will come out winners.

Many carriers, burned by oil price volatility in the past, hedge their fuel bills--agreeing to pay a predetermined amount for future jet-fuel deliveries. British Airways-parent International Consolidated Airlines Group, for example, has locked in 74% of consumption over the next 12 months, also above market rates.

But the oil-price drop will allow most carriers to be more flexible about flying older jets longer. At current jet-fuel prices, 10- to 15-year old, single-aisle jets--like the earlier-generation Airbus Group NV A320 or the Boeing Co. 737, are 10% to 15% more cost effective than newer ones being delivered, according to estimates by UBS. Those older jets even have a small edge over the crop of next-generation jets--the Airbus A320neo and Boeing 737 Max--that the plane makers are set to introduce in coming years. Older, wide-body jets may also be more attractive now than some of the newer models.

"The usage of older aircraft is again more attractive and profitable for our customers," said Michael Schreyögg, program chief at Germany aircraft engine maker MTU Aero Engines. "There is a risk" some new plane order will be cancelled, though that had not yet occurred, he told investors recently.

Aircraft such as the Boeing 757, used heavily by U.S. airlines on transcontinental routes and flights to Europe, could remain in service longer than anticipated, Mr. Schreyögg said.

MTU also believes that some Boeing 747 jumbo jets--put out of service when fuel prices were high-start becoming financially attractive again with fuel costs below $80 per barrel. Brent crude was trading around $60 per barrel Friday.

Airlines' gains could mean plane makers' pain. Boeing and Airbus have enjoyed a record run of order bookings from airlines. A key selling point: they promise double-digit percentage cuts in fuel burn over jets now in service.

Boeing and Airbus have played down the potential impact of lower oil prices on their production plans. The new Boeing's 787 Dreamliner was conceived as a fuel-cost saver at $40 a barrel for oil, the planemaker's marketing chief, Randy Tinseth, said on his blog this week.

Airbus's chief operating officer for customers, John Leahy, said last week that short-term fuel changes don't alter fleet plans. "You aren't buying airplanes for one-year or two-year operations. They're not cars."

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