After trading the gloves for the stink bombs at the Newsstand, check out the 
boards from time to time to see what flights are arriving or departing. If you 
see 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. Immediately as passengers are going through the door, 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.