The WWDC keynote and iOS 9 preview page https://www.apple.com/ios/ios9-preview/ mention "If you get an email with a flight reservation or restaurant confirmation, iOS 9 can create a suggested event in Calendar for you."
Haven't found any documentation on whether developers are required to do anything special to their emails, along the lines of how Google requires the schema.org tags https://developers.google.com/gmail/markup/reference/event-reservation , perhaps.
I've got several emails in my Inbox in the Mail app that refer to restaurant and flight reservations but I'm not seeing any suggested events in Calendar, even though I've enabled the "Events Found in Mail" preference at the bottom of Settings->Mail, Contacts, Calendars.
Anyone know any more about how this is supposed to work?