hey phoner, what class will you be flying in? depending on if those seats have power outlets, you might want to consider an ABS mayhem g3/internetishop UN25K/ibuypower SL-turbo (~7.5 lbs, 15.4" wxga) or acer ferrari 3200 (~6.5lbs, 15" sxga+) which are Athlon 64 notebooks. both get around 3 hours on batery doing basic stuff and ~1.5 hours gaming (the A64/9700 automatically clocks down to 800mhz when on battery, but can be overridden). with the ferrari however you'll want to buy 2 512mb ddr400 sodimms to replace the ones already in the laptop and a hitachi 5k80 or 7k60 (5400rpm 80gb drive or 7200rpm 60gb drive) because it only comes with 512mb of ddr333 and a 4200rpm 80gbhard drive (both suck IMO
). both sell for similar prices and trust me you won't be unhappy with either. i think.
also, the ferrari's slot-loading dvd burner can support dvd-ram, while the other one only supports + format and is tray loading.