You can travel by talking to the Flight Attendant NPC at the Plaza.
-Choose “Travel” when talking to the Flight Attendant, to choose your destination.
-There are 5 total regions, Northeast Asia / Southeast Asia / Europe / America / Vietnam, that you can travel to.
-To travel, you need a free Travel Ticket or a certain amount of Gems.
-Your passport will receive a stamp for every region you’ve travelled to. You can view your passport under [Profile > Plane icon on the bottom].