What do I do after I get the levistone in final fantasy 1.

Go to the desert south of Crescent Lake. As soon as you step on any patch of desert, go to MENU and select the Levistone. You will then receive the airship.

Tags: airshippatchdesertfinal fantasy 
Thursday, February 02 2012
Source: http://www.cavesofnarshe.com/ff1/gamefaq.php#Q16