Cheap Airline Flights – rates tickets price

Sean asked: I am looking to spend some time in South America. Particularly, I am looking to live in Bogota, Colombia and travel to other countries on the continent. Does anyone know any good websites for finding cheap plane tickets, train tickets, bus tickets, etc. Is there some equivalent to the US’s orbitz, expedia, travelocity, [...]

sma200 asked: whenever i do a flight search on american airlines, or such… there are always little boxes that say promotion code: i am guessing that this allows for a code to be entered in, and get plane tickets at a cheaper rate. does anyone know what it takes to get some of these codes? [...]