[jQuery] ajax complete function not being called

[jQuery] ajax complete function not being called


I'm making a call to a Twitter JSON feed, and when I pass an incorrect
username, jQuery's ajax complete method never gets called.
An example of a JSON response that causes complete not to be called
(nor error, nor success) is: http://twitter.com/users/show.json?screen_name=bhdjbhubeuhfbfbjfbjf
Here's my code:
$.ajax({
    type: "GET",
    url: "http://twitter.com/users/show.json",
    cache: false,
    data: "screen_name=" + $('#account-id').val().replace(/^\s*|\s*$/
g,''),
    dataType: "jsonp",
    async: true,
    success: function(j){
        alert('success');
    },
    error: function(xhr, ajaxOptions, thrownError) {
        alert(xhr + ' ' + ajaxOptions + ' ' + thrownError);
    },
    complete: function() {
        alert('finished');
    }
});
Any ideas on why the complete method isn't getting called?
Shouldn't this always get called?
Thanks!