I'm afraid I'd need more information than what you've given to tell you that.
As he said that, the carriage slowed to a stop. The military yards were a massive walled complex, filled with men marching and machines of war- massive armored vehicles with long, thin barrels protruding from them, huge, mortar-like guns on wheels, and a number of airships puttering overhead. The king led them into a large, arched building, where three large machines sat- the aforementioned planes. 141 feet and an inch from wingtip to wingtip, and 99 feet long. Each wing had a set of two propellers, and along the top and bottom were 12 gun turrets, 6 on each.
I give you the three most powerful air assault weapons in existence, capable of killing a fully grown adult dragon with little damage taken.