What are the largest airplanes currently in production and how much do they cost?

Question

Piston Single Engine:

Piston Multi-Engline:

Turboprop Single Engine:

Turboprop Multi-Engine:

Turbofan Single Engine:

Turbofan Multi-Engline (2):

Turbofan Multi-Engline (3):

Turbofan Multi-Engline (4):

Answer 1

ill answer one of them now-the largest airliner(turbofan (4))is an airbus a-380.these cost over 300 million american dollars.airbus spent over 30 billion dollars developing it

currently singapore airlines is the only airline with an a-380 and qantas will have one shortly-hope this helps you:)