A Boeing 787 Dreamliner operated by LOT had to land unexpectedly in Iceland on Sunday due to a fault in its identification system, a spokeswoman for the airline said on Sunday.
The plane was flying from Toronto to Warsaw when it was forced to land at the island's Keflavik airport, at Reykjavik.
"The aircraft had to land due to an air identification system fault. The Norwegian authorities have refused permission to fly over its territory, even though other countries gave permission to fly over theirs," Barbara Pijanowska-Kuras said.
Boeing said the diversion resulted from an "inoperative antenna" used to transmit the plane's identification information during flight. Flight is allowed with the antenna not working, but requires air traffic controllers along the route to pre-approve the flight, Boeing said.
"LOT has already made the proper arrangements and parts and personnel are en route to address the issue and return the airplane to flight status," Boeing spokesman Marc Birtel said in a statement. "Boeing stands ready to help if asked."
Norwegian Air Shuttle on Saturday took one of its 787s out of service and demanded that Boeing repair the plane after it suffered repeated breakdowns.
For state-owned LOT, which has struggled for years with huge operating losses, the incident adds to a list of problems with the Dreamliners. Last week it had to delay flights after checks showed two planes lacked fuel filters.
LOT is demanding compensation for lost revenue and has given Boeing until the end of the year to settle on compensation over faults or face court action.
Pijanowska-Kuras said that LOT had sent two aircraft to get the 787s passengers to Poland, while Boeing's service company will be working to solve the issue so that the Dreamliner could be taken to Poland "as soon as possible".
She said it is too early to say whether the unexpected landing in Iceland would be added to LOT's list of claims from Boeing.