Flight times entered into your calendar change as you fly to a another time zone. This makes you either very early or very late! I asked their App Support and they responded with the following quote "When the calendar’s time zone changes, i.e.- when you are traveling, flight items (or meetings/ ground transportation items) will change in accordance to the new time zone."
For me, this makes the app useless for any traveler.
AzShopper about WorldMate Travel Plans & Flight Tracker