TOKYO--Japan's two main airlines, All Nippon Airways Co. (9202.TO) and Japan Airlines Co. (9201.TO), said Thursday they were studying the decision by the U.S. Federal Aviation Authority to halt flights of Boeing 787 Dreamliners by U.S.-registered carriers, but had not yet made any decisions on future actions.

The two carriers have among the largest fleets of the aircraft, which began flying in the fall of 2011, and rely heavily on the aircraft as part of their strategies for international service.

"We'll examine the information we've gotten so far and exchange information further as necessary and will attempt to take appropriate steps as soon as possible," said a spokeswoman for ANA.

The firm "has not made any" decisions over future use of the 787s, she added.

A spokesman at JAL said that it is too early to comment on the FAA decision but added that "we will continue to collect information."

He said no decision has been made on flights using the 787.

Shares of both companies were lower in early trading Thursday with ANA off 1.6% at Y179, while JAL was down 1.2% at Y3,630.

Both carriers have suspended their Dreamliner flights through Thursday following the emergency landing of an ANA flight in southwestern Japan on Wednesday after one of the plane's batteries began to give off smoke, setting off alarms. The plane landed safely with passengers and crew using emergency slides to escape.

The Boeing Dreamliner employs advanced materials and systems to help reduce weight, making it more fuel efficient. But it has recently experienced a number of technical problems, raising doubts about reliability and safety.

Write to Kosaku Narioka at kosaku.narioka@dowjones.com and Hiroyuki Kachi at hiroyuki.kachi@dowjones.com

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