Looking to broaden their new partnership, Lufthansa and Etihad are forging closer ties. Back in December, the airlines announced the start of a new relationship with a series of codeshare flights between Abu Dhabi and Berlin, with service into Colombia and Brazil. Last month, the Lufthansa Group announced it would provide catering services to Etihad flights in 16 cities under a new four-year, $100 million contract. The airlines have also begun to explore additional cooperation for maintenance, repair, and overhaul services. A joint venture agreement, which would see the carriers plan and operate flights together, has not been ruled out either.