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Polish airline to resume flying Boeing 787s June 5

FILE - This Feb. 11, 2013 file photo shows a Boeing 787 jet taxing following a test flight, at Boeing Field, in Seattle. The Boeing Co. reports quarterly financial results before the market opens on Wednesday, April 24, 2013.(AP Photo/Elaine Thompson, File)

WARSAW, Poland (AP) -- Poland's national airline, LOT, says it is resuming flights on its two grounded Boeing 787s on June 5 and is selling tickets for the flights.

LOT said earlier this week that it would resume flights on the 787s in June without giving an exact date.

The world's total fleet of 50 Boeing 787s has been grounded since Jan. 16 as Boeing and investigators tried to determine why one aircraft battery caught fire and another smoldered, forcing an emergency landing. Both cases concerned aircraft owned by Japanese airlines. To solve the problem, Boeing is making changes to the battery design and adding a steel enclosure to prevent any overheating from affecting the plane.

LOT's 787s will at first fly from Warsaw to Chicago and later to New York, Toronto and Beijing.