Drill down on airline flights in Calendar entry

Spouse travels frequently, and I enter the flights in my calendar to keep track. A while back, I learned that entering a flight number in the calendar entry made a clickable link to "Preview this flight", which would show me current details. This has been exceptionally useful, showing me current information on the flight, whether it's normal, delayed, arriving early (yes, it happens!) or even cancelled.

Upgraded all our phones to 17.7 recently, and now this doesn't work. Is there something I need to set/reset? Or did this feature simply disappear? If so, that's very annoying - put it back!