Ironclad

An "Ironclad" is an expensive type of airship presumably made out of iron and other metals. As the most expensive ship sold in Klugetown, an Ironclad is very stable, durable and reasonably fast. However, the downsides of Ironclads come in their handling and mobility, as they're generally considered the worst of the ones sold.

Behind the scenes
Ironclads are a real type of ship developed in the 19th century. In My Little Pony, Ironclads are a type of airship that appeared in The Official Movie Sourcebook. They sale for 1,000,000 valuables with a speed stat of 7, stability of 300, armor of 15 but handling of "2x downgrade".