Travelers flying in and out of America’s busiest airports can expect slowdowns and cancellations caused by staffing issues related to the government shutdown.

The Federal Aviation Administration announced Wednesday it would reduce air traffic by 10% across 40 “high-volume” markets. The change will impact flights across the country and slow down travel for millions of travelers. It goes into effect Nov. 7.

Airlines such as Southwest have posted alerts to customers with guidelines. Southwest told customers:

The FAA did not initially release a list of airports affected by the slowdowns but locations have emerged through media reports. No airports in Alabama are impacted.

According to a list compiled by USA Today, here are the airports included in the slowdown:

Anchorage International

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