Check out the boards from time to time after trading the gloves for the stink bombs at the Newsstand to see what flights are arriving or departing. If you see that a competitor that you really hate has a flight today, make a note of the time. Go to the gate at least 30 minutes before the arrival/departure. When you arrive, enter the boarding area and go to the door as if you were getting on the airplane. As passengers are going through the door, quickly drop your stink bombs. It will make the whole flight sick to their stomachs and decrease the competitor's reputation. You can repeat this as many times as needed.