An iPad (fully charged) with no use in a bag could easily stay powered for the length of any flight. I don't use my iPad often, and when it's 'locked' it can last for a few days on that battery charged. I don't think battery life would be an issue at all.
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Wouldn't you have to leave it powered on for the entire flight? Seems like it would drain the battery before you got there.
An iPad (fully charged) with no use in a bag could easily stay powered for the length of any flight. I don't use my iPad often, and when it's 'locked' it can last for a few days on that battery charged. I don't think battery life would be an issue at all.