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Singapore Airlines First Class and Business Class space is hard to get with United and US Air miles. Except right now, there is a glitch you can exploit, and the space is widely available. This glitch may be fixed as early as 10 AM ET, so if you want some of the best awards around, get them right now.

I won’t say too much; instead read this post by Lucky, and the FAQ about that post.

Here is the upshot: Book the Singapore space NOW if you have United miles! Say you live in Phoenix and want as Asian vacation departing 4/15/13. You find LAX-SIN space on the direct all-business class aircraft for 60,000 miles and $2.50 on 4/15/13. Book that segment right now with United miles.

You can make changes for 24 hours to a United reservation for free. So you have 24 hours to find PHX-LAX and SIN to wherever you’re going. But that LAX-SIN will disappear as soon as Singapore figures out how to solve the glitch. You want it booked before then.