At the bare minimum aircraft owners are required to purchase liability insurance covering the operations of the aircraft. If the aircraft is financed they must buy hull replacement insurance is also required.

the hull is the body of the aircraft, just like the hull of a ship is the body of the ship. it is the outside skin and the framework

Contact an aviation insurance agent. This depends on several different factors, and typically, aviation is a specialty class that most insurance agents don't work with.

hull means Body or frame of the ship or plane

There are many insurance companies that specialize in aircraft insurance. A few of the best include: USAIG, EEA Aircraft Insurance, and Avemco Aviation Insurance.