With the ever-changing airline industry, your miles may not be there when youneed them

valign=”top”>activity every 36 months 8,000-15,000 miles to upgrade (one-way) Continental/OnePass www.continental.com More than 70 500+ None 25,000 miles w/in the U.S. & Canada   28 airlines     15,000 miles to upgrade (one-way) Delta/SkyMiles www.delta.com More than 90 900+ None as long as there is 25,000 miles w/in U.S. & Canada   19 airlines   36 months 5,000-10,000 miles to 36 months upgrade (one-way)

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