Korean Airline rent PSPgo to passengers for in flight entertainment:
http://www.siliconera.com/2010/01/14/korean-airline-uses-pspgo-for-in-flight-entertainment/
http://www.siliconera.com/2010/01/14/korean-airline-uses-pspgo-for-in-flight-entertainment/
The South Korean based airline announced a PSPgo rental service for flights out of Incheon. Passengers can borrow a 16GB PSPgo for 4,000 won ($3.50).