Yes. It has to be unloaded and secured, you have to declare it, and the firearm itself has to be legal both at the point of origin and at the destination.
It can be transported in your CHECKED baggage after you declare it to your airline. It cannot be carrried aboard by you. Check with your airline.
It depends on what you mean. You can transport some weapons such as handguns, shotguns, and knives in your checked, locked luggage, but you are not allowed to carry these items on your person or in your carry on luggage. To transport a firearm, you tell the ticket agent that you want to check an unloaded firearm. They will give you an orange tag that you sign and then that tags goes into your luggage.
Yes alcohol in checked luggage is permisible.
If its in your checked luggage, not your carry ons.
Yes, checked luggage is X-rayed and may be subject to further screening.
Yes, wine maybe carried in checked luggage.
Yes, you can pack knives in your checked luggage.
Sure, you can put tools in checked luggage, or at least most tools. If an oxyacetylene torch is considered to be a tool, that would not be a good item to put in your checked luggage, since there is some potential for explosion.
Checked luggage is that which has been checked in: weighed, labelled, and taken away to be loaded onto the plane. You don't see it again until you have landed at the other end and the plane is unloaded. Hand luggage is that which you can take onto the plane with you and have access to during the flight.
yes
Generally, weapons are not allowed in carry-on luggage but can be placed in checked luggage it they are unloaded and properly stored.
No, usually the checked weight is different from the weight of the hand luggage. Check with your airline