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Video is quite the power consumer. It requires both the processor and the graphics chip/card to work at a constant rate and keep the harddrive spinning too. I would estimate a fully loaded battery, in good condition, would give you anywhere between 2-4 hours of effective movie watching.
I would definitely NOT bring an external drive. Maybe, just maybe a USB memory but otherwise store all videos directly on its internal harddrive.
Depending on the airline and the model of the plane, there is a likelyhood that you will have in-flight entertainment built into the chair in front of you. It might not be worth to carry along another device just to watch a movie or two.
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The truth is not affected by the beliefs, or doubts, of the majority.
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