Travel to Central America has always been very expensive from the US. However, the trade routes into Panama have consistently provided an opportunity for discount travel airfare to and from Panama. Delta flights can also be combined with Air France-KLM and Alitalia to offer access to the world’s largest transatlantic network. They also offer Mix and Match fares which are simply 2 one way tickets from different providers packaged together to get you the best deal.
Be aware however, that some only offer discounts to students under a specific age. One Travel borrows its interface from Google Flights’ calendar search …