Hans, Im with you on flying with boots.... I use Carpincho boots (Argentine Cowboy 'Gaucho' Boots) that dont have metal, but for someone that understand the love for boots I see why you dont want to use anything else.
In any event, Ive seen people taking off their shoes to get Xrayed (also high platform shoes or even sneakers), so apart from that inconvenience you should be fine.
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Gaucho100K