Great question — answering as the UphillTech team:
You are free to pack these with you in checked luggage (the items have to be sheathed or otherwise covered); the restriction is for carry-on luggage only. Generally speaking, anything that can be used as a weapon is prohibited on board the aircraft. In some places, the restrictions are more tough than others. In the US, for example, anything that can be used as or confused with a weapon is not allowed on board. The TSA only prohibits knives (unless they are rounded or plastic butter knives). They do not have any restrictions on forks and spoons. This covers any airline flying to or from the US. British Airways specifically prohibits knives longer than 6 cm (see this pdf dated March 2016)....
Full answer by Burhan Khalid: https://travel.stackexchange.com/a/73109 (CC BY-SA 3.0).
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