The International Longshoremen’s Association says they’ll walk off the job at midnight if they can’t reach a deal on their contracts with the United States Maritime Alliance.

With a strike deadline looming, the union for 45,000 dockworkers and the group representing East and Gulf Coast ports have exchanged wage offers, leaving a ray of hope that a deal can be reached without a major work stoppage.

A group of dockworkers are likely to strike this week in ports from Maine to Texas. Here’s what we know about ports on the Mississippi Coast.