Normally the empower ones cover all the 12/15V systems. The connector is either an empower connector OR a cigarette lighter. I believe SAA has an empower connector
Some carriers like SK/LH have a 110 volt plug in premium cabins. All you need is your standard notbook power supply.
Try here:
http://www.xtendmicro.com/
Other mfr's like Targus also make empower compliant power supplies. I would really try to get a set that you know has been tested on your notebook to avoid any potential long term problems.