interlining
n.— «He said the EU did not want to keep on giving antitrust immunity to airlines that discuss prices with rivals when they give customers one ticket for a journey on at least two carriers—a practice known as interlining—saying it no longer benefits passengers.» —“EU to end exemption that allows airlines fix prices for multi-carrier trips” in Brussels, Belgium International Herald Tribune (Paris, France) June 29, 2007. (source: Double-Tongued Dictionary)