Seattle-Tacoma International Airport is one step closer to opening a new terminal, part of the airport’s master plan to accommodate millions of passengers moving through the crowded airfield.

The Federal Aviation Administration last month approved 31 projects at Sea-Tac to help the airport keep up with an expected uptick in demand. Those projects include the new terminal, extended taxiways, new cargo warehouses, a parking lot for airport employees and a fuel storage facility.

The new terminal, planned just north of the existing one, would add up to 19 gates to the 89-gate airport. Sea-Tac’s plan also includes an “automated people mover,” like a train or shuttle, or even autonomous vehicles, to connect the new terminal with the main terminal and rental car facility.

In an environmental r

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