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Mostly it's due to the iLiad not having good power management features. iRex originally intended on having things like a suspend or hibernate mode in the iLiad, but it never happened. What they said is that it's impossible based on the hardware and OS combination that the iLiad is based off of.
Just a question, but do you plan on reading non-stop for the duration of the flight, or can you turn the iLiad off when you're not using it? That will make the battery last a lot longer. If you don't need to be reading continuously, then 15 hours of "on time" may be enough to get you through a flight.
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