ships floating in air?

No. "Ships sometimes appear to be floating in the air due to a phenomenon known as a superior mirage. This optical illusion happens because of a temperature inversion, a specific atmospheric condition. Typically, air temperature drops with altitude, but during a temperature inversion, a layer of warmer air sits above a layer of colder air. This inversion causes light rays to bend downward towards the observer's eyes, making it look as though a ship is hovering above the water. While superior mirages are most commonly seen in polar regions, they can occasionally occur in other areas under the right atmospheric conditions." (from Dark Science)