<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by clacko:
the value of ff mi's depends on the use. upgrading on international flights can often result in a value of ~ 8 cents/mi when taking into account the cost of a business ticket. this is my most often use of mi's. the other frequent use is last minute flight needs.</font>
That is true, but due to capacity controls and blackout dates, miles are not nearly as easily usable as cash and that is another wrench in the equation.