Main Line Operators (MLO)

What are Main Line Operators (MLO)?

A main line operator (MLO) is a carrier that owns and operates ocean-going vessels on major international trade routes. MLOs run scheduled services between key ports, providing the consistent capacity and sailing frequency that underpin global container shipping.

Alongside operating fleets, these carriers manage network planning, vessel deployment, and port calls to move high volumes efficiently across long-haul lanes. Their services are widely used by large importers, exporters, and logistics partners that need predictable coverage across major markets.

Why Main-Line Operators Matter

Main-line operators support global trade by providing:

• Scheduled capacity: Regular sailings on major trade lanes that support predictable transit planning.

• High-volume movement: Large vessels capable of transporting significant container volumes efficiently.

• Extensive port coverage: Direct connections between major international ports.

• Network reliability: Coordinated vessel deployment and schedule planning that help stabilise supply chains.