Other ways I can think of to contact the owner:
(1) The default kindle name at the top of the device is "ABC's Kindle", where ABC is the Amazon username. The finder could try contacting said user on Amazon on the off-chance that he didn't rename his kindle.
(2) Post a thread on the kindle forum at Amazon.com about a kindle left behind on a flight. Ask the original owner to reply to the thread by submitting a screenshot of the kindle serial number as listed on his Amazon page. Verify with serial number on device to confirm ownership.
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