ALTO — Gate Optimization for Alaska Airlines at SEA

Scenario

Day

Any day of 2023. Alaska ran 132 to 256 aircraft turns a day at SEA.

Delay an aircraft

minutes late

Close gates

Click any gate to shut it, or close a whole concourse at once. Concourse D is shared with American, so the model treats it as overflow. The North Satellite really has closed for construction.

Delay cost $98.41 / minute

Airlines for America put direct aircraft operating cost at $98.41 per block minute in 2025.

Delay propagation 0.75

How much of a delay carries into the aircraft's next flight once slack is used up. This one is an assumption, not a published figure.

Solve exactly

Runs the integer program instead of the network flow model. About 9% less passenger walking, but ~20 seconds instead of ~1. Gate count is optimal either way — that was proven on 16 days.

2023 at a glance — gates needed each day

Loading the year…

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Cost of the disruption

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Recovered by re-optimizing

Share of the damage recovered

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Aircraft moved to a new gate

Where the money goes

Scenario	Delay	Idle gates	Towing	Total	Gates
Run a scenario to fill this in.

Gate occupancy

at gate towed off-gate moved to a different gate running late

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