Panasonic DVD-LV57 Portable DVD Player
Longest battery life, good picture, & lightweight.
I've used this DVD player during air and auto travel for the past 4 months. It is a solid performer and I can recommend it highly. Light weight, good picture quality, intuitive controls, and the longest lasting battery in the market--which is more important than picture size since you cannot recharge batteries during a flight. My only beef with the unit is that it has anemic speakers (as do all competing units) that are hard to hear over jet engines and auto noise. But since speakers would annoy others anyway, I simply use headphones and get better sound. The player puts out enough audio to drive a companion's headphones. The screen has an adequate acceptance angle to permit two viewers to see a good image during a flight. When used with a cheap RF video modulator (e.g. Radio Shack), the DVD player transmits a very high quality picture to the TV's available in motels & vacation homes.