FTPS client functionality in AIX? (FTP-TLS/ FTP-SSL

I have a client that requiers secure FTP transfers for sending data to me.  My FTP server supports FTPS and I've configured it to accept FTPS using FTP over SSL (Explicit).  

This client wants to be able to setup automated transfers on his server to my FTP site.  His server is running AIX, and his management won't let him install any software on the server.  They're completely inflexible and if I can't get this guy to be able to connect to my FTPS (SSL) server, we'll be at an impass, as it would require me to convert all kinds of things at the expense of other clients time/frustration.  

The client's AIX system has an SFTP client built-in but he doesn't know if it has a FTPS client.

Basically, is there a native way for this guy's AIX server to connect to my FTPS (ftp over ssl) server?  

Who is Participating?
You have to compile lftp (http://lftp.yar.ru)
Vadim RappCommented:
Here's an example of the FTP over SSL session log. The server is of course different since I don't haev AIX, but the FTP should be the same. I have highlighted the pieces that tell that it's indeed secure session.

[07:42:09] SmartFTP v2.5.1006.38
[07:42:09] Resolving host name ""
[07:42:09] Connecting to Port: 21
[07:42:09] Connected to
[07:42:09] 220 Polyscience FTP Server
[07:42:09] AUTH TLS
[07:42:09] 234 Using authentication type TLS
[07:42:09] Connected. Exchanging encryption keys...
[07:42:09] Session Cipher: 128 bit RC4
[07:42:09] TLS encrypted session established.

[07:42:09] PBSZ 0
[07:42:09] 200 PBSZ=0
[07:42:09] USER vadimrapp1
[07:42:09] 331 Password required for vadimrapp1
[07:42:09] PASS (hidden)
[07:42:09] 230 Logged on
[07:42:09] SYST
[07:42:09] 215 UNIX emulated by FileZilla
[07:42:09] Detected Server Type: UNIX
[07:42:09] FEAT
[07:42:09] 211-Features:
[07:42:09]  MDTM
[07:42:09]  REST STREAM
[07:42:09]  SIZE
[07:42:09]  MODE Z
[07:42:09]  MLST type*;size*;modify*;
[07:42:09]  MLSD
[07:42:09]  AUTH SSL
[07:42:09]  AUTH TLS
[07:42:09]  UTF8
[07:42:09]  CLNT
[07:42:09]  MFMT
[07:42:09] 211 End
[07:42:09] CLNT SmartFTP 2.5.1006
[07:42:09] 200 Don't care
[07:42:09] OPTS UTF8 ON
[07:42:09] 200 UTF8 mode enabled
[07:42:09] PWD
[07:42:09] 257 "/" is current directory.
[07:42:09] Compression disabled for private IP addresses.
[07:42:09] TYPE A
[07:42:09] 200 Type set to A
[07:42:09] PROT P
[07:42:09] 200 Protection level set to P
[07:42:09] PASV
[07:42:09] 227 Entering Passive Mode (127,0,0,1,12,18)
[07:42:09] Opening data connection to Port: 3090
[07:42:09] MLSD
[07:42:09] Connected. Exchanging encryption keys...
[07:42:09] 150 Connection accepted
[07:42:09] Session Cipher: 128 bit RC4
[07:42:09] TLS encrypted session established.

[07:42:09] 4143 bytes transferred. (64.2 KB/s) (63 ms)
[07:42:09] 226 Transfer OK
[07:42:40] NOOP
[07:42:40] 200 OK
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