During Mark Reis’ tenure, Sea-Tac opened the Central Terminal and Concourse A and completed its third runway, a new air traffic control tower and a new rental car facility.

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After 27 years working for the Port of Seattle, Mark Reis, managing director for the Port’s aviation division is retiring next year.

Reis oversees operations and capital projects at Seattle-Tacoma International Airport, helping to build one of the most successful airports in the nation, according to a release.

“Mark’s dedication to the Port of Seattle, the airport, and the people of this region has helped us manage both the recent record-breaking growth at the airport and the economic downturn before that,” said Port of Seattle CEO Ted Fick.

Last year, Sea-Tac Airport handled a record number of passengers — nearly 37.5 million, up 7.7 percent from 2013, making it, by some counts, one of the fastest growing large hub airports in the U.S.

Last month the port hit another record, brining in more than four million passengers in a month — for “the first time ever,” the port said in a release.

If this pattern continues, the total number of passengers for the year could reach more than 42 million. The port projects passenger traffic to grow to 66 million two decades from now, meaning airport facilities need to be upgraded.

Reis’ retirement announcement comes as the much-debated International Arrivals Facility, expected to open in 2019, is moving closer to reality.

Under Reis’ tenure, the airport opened the Central Terminal and Concourse A and completed its third runway, a new air traffic control tower and a new rental car facility.

The port’s plan is to hire a search firm to find the best candidate to replace Reis.