according to the TSA policy, no aerosol cans are allowed. It doesn't specifically say airhorns but it should be implied. i.e. spray cans, lighter fluid cans, hair spray cans.
For the US, No
Yes, most airlines allow laptops to be taken on air planes.
No, extension cords are not allowed on planes due to safety regulations.
Yes, CDs are allowed on planes as part of carry-on luggage.
Yes, electric lighters are allowed on planes in carry-on luggage, but not in checked baggage.
No, razor blades are not allowed in carry-on luggage on planes.
Yes, magnets are generally allowed on planes as long as they are not considered dangerous goods or pose a risk to the aircraft's navigation systems. It is recommended to check with the airline or relevant authorities for specific guidelines on carrying magnets during air travel.
no smoking is allowed on public planes, national and international
No, poppers are not allowed on planes as they are considered a hazardous material and can pose a safety risk during flight.
Yes
Yes.
No.