[unkl_]

I found out some years ago that emails that have the fancy features like plane tickets embedded or tracking information are all done with JSON-LD in the emails.

AFAIK only gmail supports it, though.

EDIT: some more info about it: https://www.emailonacid.com/blog/article/email-development/s...

[bob778]

Outlook and iCloud support a subset (like tickets and reservations) too