To cope with excess capacity and improve service quality, maritime international liner carriers have recently adopted a new operational model known as daily frequency. In this new
model, carriers provide daily pickup and delivery service to customers at major ports along
the Pacific Rim. We investigate the ship routing and freight assignment problem for daily
frequency operation of liner shipping. A solution procedure that incorporates a Lagrangian
relaxation technique and local search was proposed. The numerical results show that
Shanghai, Hong Kong and Singapore are ports that are ideal for carriers in establishing daily
frequency operations along the Pacific Rim.