That may be what you think you see when you book a ticket via an OTA , but actually that’s not what the underlying fare is. I assure you this is a ALG-JFK fare that allows routing through LAX, and a stop over there. JFK is your destination, you just don’t have to stay there at all because there is no minimum stay on this particular fare. Try booking Iberia ALG-LAX without going to JFK in either direction, you won’t be able to for this price, and there in lies your first clue that this fair is not between Algiers in Los Angeles.