Low-fare giant Southwest Airlines, upset about the skyrocketing cost of flying out of Seattle-Tacoma International Airport, is considering moving its Seattle operations to Boeing Field.

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Low-fare giant Southwest Airlines, upset about the skyrocketing cost of flying out of Seattle-Tacoma International Airport, is considering moving its Seattle operations to Boeing Field.

Southwest has been quietly talking with county officials for more than a year about flying out of King County International Airport. Those discussions reached the point that it was time to inform the county council and the public of a possible agreement, county executive Ron Sims said today.

The nation’s biggest domestic carrier, Southwest has made an art of keeping its costs low by avoiding premium-priced airports and flying out of second-tier locations, such as Oakland instead of San Francisco and Chicago’s older Midway Airport instead of O’Hare.

But yesterday’s annoucement is sure to spark controversy because of the potential for more noise at Boeing Field. A move would mean less revenue for Sea-Tac airport, which recently spent $4 billion to increase its capacity, in part to accommodate the growth of airlines like Southwest.

“It’s a terrible idea,” County Councilman Dwight Pelz said. “We’ve got an airport. It’s called Sea-Tac.”