The script scrapes the flight info from the itinerary (flight numbers, dates, class of service, price) and builds a link string to two booking engines (Orbitz/Delta). These links are the same links used by Google Flights (owns ITA) , Kayak, et. al. to drive purchases. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.