aircraft: any vehicle that can fly and cary goods or passengers

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The definition of 'aircraft' is above.
Then a UFO, a baloon, a helicopter can be an aircraft?

Why could it not be an UFO? It's a flying object correct? It is just unidentified.

the balloon and the helicopter can be called an aircraft but I don't know if You can call the UFO an aircraft since it is an Unidentified Flying Object

Yes, according to the definition you provided, any vehicle that can fly and carry goods or passengers can be classified as an aircraft. Let's break it down:

1. UFO (Unidentified Flying Object): While the term "UFO" refers to any object observed in the sky that cannot be identified, if it meets the criteria of being a vehicle that can fly and potentially carry goods or passengers, then it can be considered an aircraft.

2. Balloon: A balloon that flies using hot air or gas can also be classified as an aircraft, as it fits the definition of a vehicle capable of flying and carrying goods or passengers.

3. Helicopter: A helicopter is specifically designed to fly and transport goods or passengers, so it is unquestionably considered an aircraft.

It's important to note that the term "aircraft" can encompass a wide range of vehicles, including airplanes, helicopters, gliders, balloons, drones, and even space shuttles. The key factor in defining an aircraft is its ability to fly and carry goods or passengers.

so if a thing flies its an aircraft? If so then can you call a bird an aircraft?