In the USA, the FAA permits bringing an empty fuel bottle.
I'm flying between the United Kingdom and Iceland on Icelandair. Can I bring an empty fuel bottle in checked baggage? It does have big "danger" signs on it.
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According to Icelandair's website, under Baggage restrictions, "Camping stoves and fuel containers that have contained a flammable liquid fuel, with empty fuel tank and/or fuel container" are "permitted in or as checked baggage", but the "approval of Icelandair is required". This statement is followed by a big button to open a "Contact Icelandair" form.