JAL spokesman Jian Yang said in a statement the airline sees the 787 tests going "to a new stage" and was ready to cooperate with others in the effort.
ANA also welcomed Boeing's plan.
"As the launch customer for the 787, ANA hopes for a resumption of flights as soon as possible, while putting safety as a top priority," it said.
Boeing executives played down fire risks, stressing that there was no fire in the Japan failure and that there was no major damage to the aircraft.
They said they would not hesitate to fly on the 787 or have their families fly on them.
They declined comment on questions about monetary compensations for the carriers, which are suffering losses because of flight cancellations.
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