Some airlines let you go through a special security line just because you have elite status (or their expensive credit card). For example, with United, I can go through the Elite line because I have a Presidential Plus card.

For Pre Check: I applied for Global Entry, interviewed, and was accepted. I entered my Global Entry number into United as soon as I received it. But the 2 times I've traveled since then, I wasn't given Pre-access. As a newbie, I'm still confused as to what I need to do to get the bypass lane access. At DCA, there was a special Pre-lane, but I didn't know if I was allowed to use it.