[UPDATE, Jan. 19, 2017: American Airlines as of Feb. 1 will cease code sharing on several Alaska Airlines' routes. Affected markets include: Seattle to/from Chicago O'Hare, Dallas/Ft. Worth, Newark, Los Angeles International, New York JFK, Philadelphia, Phoenix and Washington National; LAX to/from Baltimore/Washington, Portland, Ore., Salt Lake City and Washington National; and Portland, Ore. to/from Chicago O'Hare, Dallas/Ft. Worth and Washington National. Effective June 2, AA will stop placing its code on Alaska's flights to/from Anchorage and LAX and Chicago O'Hare. According to AA, Alaska will . . .

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