Seattle-Tacoma International Airport (SEA) is building a new International Arrivals Facility (the IAF) which has a 708-foot-long aerial walkway as one of its features.

When in place, the walkway will look like this and be the longest structure over an active airport taxiway.
Pretty impressive, right?
But as impressive is what it takes to make the project happen.
For example, overnight on Thursday, the center span of that elevated pedestrian walkway was – very carefully – moved down the closed center runway to its new home.
Here are some of the tweets SEA shared as the process unfolded.
Pedestrian walkway first look! 👀 This center section will complete the IAF aerial walkway structure. It was built offsite and is the largest and most complex pre-fabricated component of the walkway weighing in at 1,560 tons. That’s equivalent to 14 blue whales! 🐳 #IAFWalkway pic.twitter.com/4CAjOhk6H2
— Seattle-Tacoma Intl. Airport (@flySEA) January 22, 2020
Get excited! The IAF aerial walkway is ready for its take-off. 🛫 Here’s everything you need to know about the move and lift. #IAFWalkway https://t.co/3toVkuFaQD
— Seattle-Tacoma Intl. Airport (@flySEA) January 24, 2020
One of the most iconic elements of the IAF — and one of the most complex engineering projects ever done at SEA — is the #IAFWalkway. It's been nearly 8 years in the making. And tonight, for the first time EVER, the walkway will be visible to travelers. https://t.co/cgJiMphS9U pic.twitter.com/xdHa0aLdhF
— Seattle-Tacoma Intl. Airport (@flySEA) January 24, 2020
The #IAFWalkway center span— loaded on to four remote-controlled transporters — has made its first turn out of the staging area where it was constructed and is headed to the runway. pic.twitter.com/ItpPITIBYD
— Seattle-Tacoma Intl. Airport (@flySEA) January 24, 2020
It's almost there! #IAFWalkway pic.twitter.com/DbygLt6LrY
— Seattle-Tacoma Intl. Airport (@flySEA) January 24, 2020
And here is the aerial walkway in place!

