A shipping alliance is an operational agreement between container carriers to share vessels and coordinate networks on major East–West trades. Members buy slots on each other's ships, which lets each offer more departures and port pairs than its own fleet could serve.
Alliances reshape global schedules: a booking with one carrier may sail on a partner's vessel. Competition authorities monitor them closely, and their composition changes periodically — with each reshuffle propagating into schedules, transit times and port calls.
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