Whether you change a hotel booking at the last minute or add more guests to your dinner reservation, the app will ensure people in the conversation stay on top of your plans. What's more, all the info is automatically refreshed, meaning your friends and family needn't leave iMessage to keep up with you. Flight info tracking in particular is a boon for frequent travellers.

Users can send all or part of their info via iMessage. But, keep in mind that all parties must have the app downloaded in order to access the itinerary.