1. Power Banks

Power banks aren’t allowed in the check-in luggage because they contain lithium cells and they have a tendency to combust. Though, you can carry around a power bank in your hand or even put it in your hand-baggage.
2. Tools

Any kind of mechanical tools aren’t allowed on flights. They can be used to physically hurt or threaten people or even destroy the airport/airline’s properties. Make sure you check that your bag doesn’t have even a tiny screwdriver.
3. Scissors

Scissors of any kind aren’t allowed in flights. A lot of men keep folding scissors in their vanity bags and must take it out before travelling internationally.
4. Lighters

Lighters are banned from flights for obvious reasons. They can cause fire because of their combustial nature and so, you must not carry them with yourself. Another important thing to note here is that even matchsticks aren’t allowed on flights.