Surprisingly you are allowed knitting needles, umbrellas, canes, and scissors with blades less than 6cm or any length if they have rounded ends.
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Knitting needles are technically allowed on domestic flights in the United States, though the latest TSA guidelines recommend that needles be “sheathed” for the safety of inspectors (this wording makes them sound more weapon-like, don't you think?).
Knitting needles on International flightsCountries that officially state (in the flight regulations) that knitting needles are allowed. These include the US, the UK and Australia. Countries that explicitly prohibit knitting needles on flights. (Greece and other countries in the EU fall into this category.)
Yes, crochet hooks are allowed on airplanes (in both your carry-on or checked) by the TSA. One note: The app does notes that sharp objects in checked bags should be sheathed or securely wrapped to prevent injury to baggage handlers and inspectors. That would go for knitting needles, as well.
Transportation authorities within Europe have no explicit restrictions on crochet hooks and generally it is possible to take crochet hooks on European flights. However, individual airlines may have their own policies regarding onboard items, so it's wise to consult them beforehand.
In addition, generally, after surgery and depending on it, it may be recommended to avoid air travel for a while because long hours of travel can increase the risk of developing a blood clot in the body's veins. But going back to what interests us, can you travel by plane with stitches? The answer is yes.
The TSA advises all needles should be enclosed in a hard shell when not in use. The best approach here is to buy something like John James Pebble, as it's clear, so the TSA agents can see, they're enclosed, and they stay they're embroidery needles (this is rarely asked, but helps to show it).
TSA considers tweezers to be completely safe, so they're allowed on planes. You can pack tweezers in hand or checked baggage without any packing restrictions. But TSA doesn't allow packing sharp objects in hand baggage because some of them could be used as potential weapons.
If packed in carry-on, they must be less than 4 inches from the pivot point. Any sharp objects in checked bags should be sheathed or securely wrapped to prevent injury to baggage handlers and inspectors. For more prohibited items, please go to the 'What Can I Bring?'
You can pack scissors in carry-on baggage, provided the size of the scissors does not exceed 4 inches from the pivot point to the tip of the blade. Anything larger than this must be packed in your checked bags.
Can I travel with needles or syringes? Needles and syringes used to inject medications are allowed past the security checkpoint if they're packed with the medication for which they're needed. Please alert a Flight Attendant if you use a needle or syringe while onboard so we can provide a disposal container.
External Medical DevicesInform the TSA officer if you have a bone growth stimulator, spinal stimulator, neurostimulator, port, feeding tube, insulin pump, ostomy or other medical device attached to your body and where it is located before the screening process begins.
Liquids, gels, and/or aerosols are not permitted, with the exception of one resealable, clear, 1-litre plastic bag that may contain liquids, gels, and/or aerosols in packaging of 100ml or less per item.