At Seattle–Tacoma International Airport, the C1 Expansion reimagines the concourse experience by significantly increasing space while improving how passengers move, rest, and connect within the terminal.

ISEC delivered a comprehensive interior scope, including custom store fixtures, bench seating, architectural wood wall paneling, casework, and decorative features throughout the concourse. Among the most impactful spaces are the Meditation Room and Sensory Room that are purpose-built environments providing travelers with a place to pause, reflect, or find relief from the activity of the airport.