Deutsche Lufthansa AG (DB:LHA) has offered concessions to try to allay competition concerns about its plan to buy assets of Air Berlin PLC (XTRA:AB1), EU antitrust regulators said. The European Commission, concerned about Lufthansa's potential dominance in Germany as a result of the plan, extended its deadline for a decision on the deal to December 21, 2017 from December 7, 2017. It did not provide details of Lufthansa's concessions.