Frequent Flier schemes make some airlines money!

The International Herald Tribune has done a great article about how FF schemes can actually make airlines money.
Link to article.
One paragraph that caught my eye was: Delta's SkyMiles members had 510 billion unused miles in their accounts at the end of last year, while the MileagePlus program offered by United Air Lines had 488 billion unused miles and the AAdvantage plan of American Airlines had 613 billion.
No wonder reward trips are hard to find. [:D]
Nick
Link to article.
One paragraph that caught my eye was: Delta's SkyMiles members had 510 billion unused miles in their accounts at the end of last year, while the MileagePlus program offered by United Air Lines had 488 billion unused miles and the AAdvantage plan of American Airlines had 613 billion.
No wonder reward trips are hard to find. [:D]
Nick