1. People who wait until it is their turn to go through security until remembering, oh yeah! You need to take your laptop out of your carry-on and the crap out of your pockets. Good thing you didn't do that during the last 15 minutes while we were waiting on line! Now we can wait a little longer.

2. People who insist on standing two abreast and blocking anyone who wants to walk past on the escalator or the moving walkway.

3. People standing 2 or 3 abreast post deplaning and making it impossible to get past them when you're in a rush to immigration.

4. The aforementioned lack of outlets for charging phones.

5. People who use the incorrect check-in lines, because they have decided they are entitled to use the first or business check-in even though they are in coach and have no status, thus forcing people for whom the line is meant to stand and wait.

To summarize, as someone did early in this thread..."people."