Typically, once a U.S. longshore negotiation is settled, the affected ports revert to a state of normalcy despite whatever disruption occurred during the talks. U.S. West Coast negotiations over the past 20 years have never been without disruption but were always followed by near-normal operations that lasted in some cases for years. The six years leading up to the June 30, 2014, expiration of the recent agreement between waterfront employers and the International Longshore and Warehouse Union saw only sporadic disruption. But there is a difference between then and now: The current agreement reached on Feb. 20 failed to resolve all issues and one in particular — chassis maintenance — stands out as holding the potential for sparking further disruption and uncertainty for shippers.