is it possible to recovery a deleted file in AIX?
yes or no, depends on your luck. But if you ask it - no, it is not possible.
If you have a copy, you can restore it. If there is are multiple hard links and only one has been removed then yes you could reconnect the missing link, but ......
In general, the OS trusts that you know what you are doing, so if you tell it to delete a file, it does. It's the same on Windows if you are using the command or DOS prompt. You would need to have something that intercepts your delete request and saved the file away (like Windows does with the recycle bin) Unless you write one, then the OS will delete the file.
I hope that this is not bad news.
Robin