People mover system at Seattle–Tacoma International Airport
SEA Underground
Interior of a Innovia APM 100 car used on the SEA Underground, refurbished with color displays
Overview
Owner
Port of Seattle
Locale
Seattle–Tacoma International Airport
Stations
6
Service
Type
People mover
Services
3
Rolling stock
21 Innovia APM 100 vehicles
Ridership
16 million (2015)[1]
History
Opened
July 1973 (1973-07)
Technical
Line length
1.67 mi (2.69 km)
Number of tracks
1
Character
Underground
Operating speed
27 mph (43 km/h)
Route map
Legend
North Satellite (N gates)
Concourse C (C gates)
Main Terminal North (D gates)
SeaTac/Airport station
Main Terminal South (A gates)
Concourse B (B gates)
South Satellite (S gates)
all stations accessible
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The SEA Underground, formerly called the Satellite Transit System (STS), is an automated people mover (APM) system operating in the Seattle–Tacoma International Airport in SeaTac, Washington, United States. Originally opening in 1973, the SEA Underground is one of the oldest airport people mover systems in the world. The APM was designed to quickly transport passengers to and from the North and South Satellites, and around the airport's Main Terminal.
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