Poland's state-owned airline LOT will not use both its Boeing 787 Dreamliner passenger jets before October, as the U.S. aircraft maker has to remove their battery-related malfunctions, Lot’s newly appointed CEO Sebastian Mikosz said Thursday.

"We do not plan to use the Dreamliner in out flight network until October," Mikosz, told reporters.

It means LOT needs to extend lease on three Boeings 767 it currently uses and will seek to lease two more 767s for the summer season.

LOT has two Dreamliners in its fleet – one remains in Chicago, the other one is in Warsaw. Boeing suspended delivery of three more planned for LOT this year.