Seattle — Oil company BP has found the source of a leak in a major Pacific Northwest pipeline system, allowing it to restart the flow of jet fuel to Seattle-Tacoma International Airport on Tuesday and help avoid any major disruptions to Thanksgiving travel.

Separately, Washington state regulators announced they were fining the company $3.8 million for a 2023 spill from the same pipeline system nearby.

The 400-mile-long Olympic Pipeline is the backbone of the region’s system for moving gasoline, diesel, jet fuel and other petroleum products from refineries near the Canadian border to distribution terminals in the Pacific Northwest west of the Cascades, including major cities in Washington and Oregon.

BP shut the pipeline system down on Nov. 17 following intermittent shutoffs after a far

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