The most underused vehicle is defenately the helicopter. Most airplanes that players build have a helicopter sign but heli signs are never used by themselves. The reason for this is that they are so damn slow. A ship with a boiler 2 engine could outrace a helicopter. The speed needs to be buffed by at least 100%. Right now almost no one uses them. People who do use helis just get shot down like fleas. Helicopters really need a buff.