By Tim Hepher PARIS (Reuters) -Europe’s Airbus posted flat first-half deliveries on Friday as it struggles to convert rising production plans into handovers to airlines amid tight global supply chains. The world’s largest planemaker said it delivered 60 commercial airplanes in June, bringing the total for the year so far to 297, unchanged from the halfway point last year. “Airbus appears impacted by some production constraints,” said Jefferies analyst Chloe Lemarie, who had earlier predicted the 21% year-on-year drop in June deliveries to 60 airplanes. Airbus needs to boost second-half deliver…