You'd better go with http rather than FTP through SSH, this way you don't have to hardcode access credentials into your application.
Hello, I've create 2 library sshcmd.swc and scpcmd.swc with adobe air 2.0 to create applications that can send files and commands to remote hosts using ssh. Same that putty.
Actually is compatible with windows air applications.
To acquire this library contact me email@example.com.