Mt. Hood Meadows and Mt. Baker announced their new reciprocal agreement for 2014-15. Unlimited pass holders can get up to 5 lift tickets at the other ski area on weekdays from January through February, as well as any day starting March 1 until the end of operations. Mt. Hood is also in the Powder Alliance. But unlike the Powder Alliance ski areas, Mt. Baker is is close enough that a drive to Mt. Hood is more likely 5-6 hours. Apparently Mt. Baker has never done this type of arrangement before.
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Edit: corrected based on clarification in a later post