>[! info] Definition >A contract between airlines that allows passengers to travel on multiple airlines on a single ticket A partnership between airlines. includes itinerary and baggage. EX: AA and Nick Airlines: No code share, interline only. Typically, ones that don't have a codeshare agreement in place. Benefits both airlines by allowing them to sell tickets on each other's flights. In a bilateral agreement --> between two airlines, would have the effect to expand both airlines networks mutually as each airline would be able to book sales on one another's "metal" in a unilateral agreement, only one airline can book on another. If a smaller airline and a large airline are in a unilateral agreement with the larger airline allowed to book sales on the smaller, but not vice versa. This is not codeshare.