British Airways owner IAG
The Commission, tasked with ensuring a level playing field in the 27-country European Union, did not provide details of the concessions, in line with its usual policy.
It extended the deadline for a decision on the deal to March 30 from March 16, the EU executive's website showed.
The bmi takeover would boost IAG's share of runway slots at London Heathrow airport to about 52 percent from 43.1 percent, allowing it to launch lucrative new long-haul routes.
Rival and failed bmi bidder Virgin Atlantic
(Reporting by Foo Yun Chee; editing by Rex Merrifield)