Seems AirAsia, a Malaysian low cost carrier, acquired an old US 737-300. (http://www.airasia.com/news.php?f=aboutus/press&p=201103)

Check AirAsia's fares. USD 71 r/t between JHB and BKK!

It's always interesting to see the history of an aircraft registration as it changes hands from owner to owner.

Slightly off topic, I was watching Celebrity Wings (on Discovery Wings Channel) and it was all about the original Playboy Jet - a black DC-9 completely outfitted with bedrooms, 16mm movie projector, disco dance floor, etc. It's now flying for Aeromexico as a passenger jet.