Japanese air regulators have said that they will take a decision on whether to allow Boeing 787 aircrafts to resume flights in the country.

Japanese authorities said that the will take another week to take a decision on the matter after the regulators in the US moved to allow the firm resume flights in the country. The entire fleet of Boeing’s 787 passenger jets were grounded around the world after it was found that the planes have an issue that could pose risk to the passengers and the crew.

Investigators had found an issue in the battery of the giant aircraft. Investigators had said that the damaged battery showed evidence of short-circuiting and a chemical reaction called ‘thermal runaway’. In thermal runaway, high temperatures causes progressive higher temperatures causing damage to the equipment.

The aircraft maker has been seeking permission to fly the plane on long transocean routes but transport officials have raised concerns over the safety issues. It is believed that if an official review is launched by the regulator, the approval might be delayed further.

Japan is the biggest customer of the aircraft and its JAL and All Nippon Airways (ANA) operate 24 of the total 49 new aircrafts delivered until December of 2012. Both JAL and ANA confirmed that they do not plan to cut down or cancel plans for the new aircraft. Boeing has sold 848 of the planes but the company had to delay the delivery schedule by three years mainly due to a series of production delays.