You should be able to just drag the AirPort Utility app from the Utilities folder (located in the Applications) to the trash.
There's also the:
/System/Library/CoreServices/AirPort Base Station Agent.app
But I wouldn't mess around with that.
Though I'm curious as to why you would need to do this, as it only stops you from configuring your AirPort equipment.
If say you didn't want someone else to be able to configure it then you don't tell them the password.
Though at-least grabbing the AirPort Utility from Apples website to reinstall it should be fairly easy, unlike a lot of the other built in applications.
Just leave it, it's not worth the hassle removing it.It gives an error something like application is required for Mountain lion. This makes no sense since this is a applications for managing Apple's WIFI devices which I do not use. the reason I want to remove it is simple its an application I will not be using on my Mac.