An internet bulletin board (flyertalk.com) that is filled with some useful hints and a lot of flaming and insulting. Filled with unnecessary drama.
"I went to go check out flyertalk to see this new Delta Airlines promotion and all I got was flaming for asking a question."
An irregular air traveler (1-2x/year) who feels entitled to use first class and premium check-in counters, attempts to board during first class or elite boarding groups. Kettles are often oblivious to boundaries such as curtains separating first class from main cabin, or by crowding around Priority boarding lanes to prevent premium customers from accessing them.
Airline passenger traveling with too much luggage both out of touch with and unaware of airport boarding and security procedures is a Kettle.