For everyday U.S. citizens, firearms are allowed in checked baggage, with restrictions. Check TSA's website, and the airline you are flying.
No,
no
No, Never.
Yes, you can bring a book on a plane.
No, it is not permissible to bring a sword on a plane.
dont bring a gun
Yes, you can bring a fork on a plane in your carry-on luggage.
Yes, you can bring a notebook on a plane in your carry-on luggage.
Yes, you can bring a thermometer on a plane in your carry-on luggage.
Yes, you can bring books on a plane in your carry-on luggage.
Yes, you can bring your contacts on the plane with you in your carry-on luggage.
Yes, you can bring a shaver on a plane in your carry-on luggage.