All air traffic will be directed to the other two runways during this reconstruction (including the new third runway), which is expected to last through September.

Portions of Sea-Tac’s longest and oldest runway date back to the airport’s original creation in 1947.

According to the Port:

“Major overhaul is required due to age and deterioration. The result will provide a safer surface and infrastructure expected to last at least 40 years.”

In addition, a new Runway Status Lights System, which signals to pilots when it is safe to cross or take off on a runway, will be installed.

The closure will not affect airline flight schedules or passengers.

However, the increased use of the third runway will likely result in more noise complaints.

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