I'm very unlikely to redeem miles for International First Class awards on a US airline — they're simply not worth it. (travelingformiles.com)
(Although we're not searching for «La Premier,» or first class, in this example, remember that Delta doesn't permit using SkyMiles for international first class awards.) (travelcodex.com)
Someone redeeming for U.S. domestic flights that are normally inexpensive will typically get much less face value out of the same number of miles or points than someone redeeming for an international first class award ticket, which could have a retail value of $ 20,000 or more. (travelsort.com)