I’ve noticed that some photographers who’ve uploaded some great shots (including staff picks) do not ‘exist’ when you click on their username that appears at the bottom of a photo’s page.
Examples:
http://flightaware.com/photos/view/85448-60cf4e4e8d89b2c2517ed85c71ea94b5a174b20d
http://flightaware.com/user/JNArmstrong (“No such user: JNArmstrong”)
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http://flightaware.com/photos/view/45753-e0b1c7a3256eba11674f2189d950c5ed254b5826
http://flightaware.com/user/MGiessel (“No such user: MGiessel”)
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http://flightaware.com/photos/view/455003-53b075cb74c9535c5dec8286736b201365f94e6a
http://flightaware.com/user/tengvalson (“No such user: tengvalson”)