How can I add a trip to my calendar?

If you want to add a trip to your calendar, find the trip in your itinerary, tap the three points menu, at the top right of your screen to open it and select the calendar option.

For iOS users: you also have the possibility to automatically add all your reservations to your calendar. Go to the Options menu in the "Services" section; there you'll find "Add trips to calendar". This option will create a new calendar with all your trips.