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On his frequent business trips he buys a coach ticket if the flight is shorter than six hours (it no doubt helps that he usually gets upgraded), and he travels on weekends.
FORBES: Magazine Article
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Both Delta and US Airways have a three-tier redemption structure, offering seats at the basic level, a midtier level at around 40, 000 miles for a domestic coach ticket and a full-fare level for as many as 60, 000 miles for domestic coach round trips.
WSJ: Frequent-Flier Miles: Best Airlines for Cashing In
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Delta says it, like other airlines, offers all seats on planes to frequent fliers, just at higher mileage cost than the lowest redemption level, which is 25, 000 miles for a domestic coach round-trip ticket.
WSJ: Frequent-Flier Miles: Best Airlines for Cashing In