Today when I tried to log in to the game at
http://www.airlinemogul.com/index.php, I found that whenever I typed in my username and password and then pressed the login button or the "Enter" key, It reloads the site, but I am not logged in. It does not show me that I got my password wrong or anything.
Here's what it shows when I enter my login details and press "Enter":

Here's what happens when I purposely typed in the wrong password:

I am using the Firefox browser, but I also tested and experienced this problem on Internet Explorer.