10. A direct relationship to the degree of rookieness with the number of pieces of jewelry/metal worn when entering security.

9. Attempting to walk the airplane aisle before the beverage service is over.

8. The lack of a BlackBerry/PDA phone.

7. The ability to bump into every aisle seat passenger on the way to his seat.

6. Irritation over a weather delay (not the agent's fault!).

5. The belief that no carry-on is too big to fit in the overhead.

4. Luggage without wheels.

3. Paper tickets.

2. Boarding groups are a mystery.

1. How does this do-it-yourself “check-in thingy” work? - Michael Dixon, Edwardsville, Illinois