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Those limits include strikes by traffic controllers, who say the Single Sky plan will compromise safety by forcing them to work more.
Controllers argue the Single Sky endangers fliers because controllers will handle more flights under tighter budget constraints.
In 2004, national governments granted the Commission authority in principle to oversee air traffic under the Single Sky.
The Single Sky "would not have solved the problem, but would have enabled a more nimble response," EU Transport Commissioner Siim Kallas said in late April, when he announced a push to fast-track the plan.
Plans for the Single Sky, which had dragged for years, took on new urgency when Iceland's Eyjafjallajokull volcano erupted in April, prompting the closure of almost 80% of European airspace.
AFP/Getty Images EU Transport Commissioner Siim Kallas champions the Single Sky plan.