Yapta will automatically name your flights for you. However, if you want to change the name here are the steps:
If you have both Booked Flights and Tracked Flights under a single trip, you may need to toggle between these various types of flights to find the one you are looking to rename. To toggle between "Tracked Flights" and "Purchased Flights" click the link "view purchased flights" or "view tracked flights" depending on which screen you are viewing.
You can also change the name of the Trip.
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