Lufthansa, Europe's largest airline group, said yesterday that capacity bumping up against limits at overcrowded airports would hem in growth this year as it reported that its bottom line fell in 2018. Net profits at the Frankfurt-based group amounted to $2.5 billion, down 8.0 percent year-on-year. Disruption to air traffic, higher fuel costs and the pricey acquisition of large parts of defunct competitor Air Berlin all weighed on the result, Lufthansa said, outweighing a 6.0-percent boost in revenues.  to 35.8 billion euros.