With this route mapper tool, you can visualize your itinerary. Input the full route you are supposed to fly by entering the three letter code for each airport. Use the - character to seperate the airport codes.
E.G.: When you fly from Amsterdam to Los Angeles with a transit in Paris, then the input should look like AMS-CDG-LAX. If you are not familiar with the airport codes, please use the tool below by searching on the city name where the airport is located.