There are two types of flying ships of the realm - skyships and voidships. Both have been around in some form or another since the Creation War. They were rare even then, and remained that way for thousands of years. It wasn't till the Second Epoch, 1176, that the making of them became better understood. This happened when the Balforn Sky Academy released it widely within Zonatarbian. The development of skyships was just a continuation of building bridges, balloons, gondolas, and other transport system to handle the rugged landscape around this city-state.
Skyships are powered by the wind, the wind and an engine, or just an engine. In most cases, a skyship cannot float.