Hey guys. Hope this is the right forum.
When a plane has its type listed here on the site, what do the last three numbers mean?
For example, a United Airlines 777 is 777-222. I know the first 2 is the -200 series, but what about the other two numbers? Is there a set system?
Another example is that both US and NW have their A330's listed as A330-323X.
Can anyone shed some light? And if there is a system, what is it?