Keg, which Bluetooth device are you planning to get?
Nitpicker. I went with the GNS5870. It arrived a couple of days ago. I'm flying tomorrow and will try it out. Glad to hear that Ozeflyer's experience is positive with the 5870. Hoping for the same.
The next thing I'll be looking for is a contraption to hold the iPad in a nice place on the side window so that it's within easy viewing but still out of the way.