German aviation group Lufthansa said Tuesday that volatile jet fuel costs thanks to the Mideast war could mean that it makes less this year than last, sending its shares down sharply. Speaking on an earnings call, Lufthansa finance boss Till Streichert said there was a question mark over how much Lufthansa could pass higher fuel costs onto customers. "We are of course expecting to continue our strategy in the second half of the year of raising ticket prices to compensate for higher fuel costs," he said. Lufthansa had managed to pass on about 60 percent of higher fuel costs to customers, Streichert said on the call. Strike action at Lufthansa also hit earnings by 200 million euros in the three months to the end of June, the company said.