So I built TripCoral. Airports and aviation authorities actually give out a lot of FIDS and air-traffic data for free: Avinor (Norway), Swedavia (Sweden), Schiphol (Netherlands), FAA SWIM (United States) etc. Instead of paying a commercial data broker, I wrote a Go collector that pulls from 100s of feeds covering ~1900 airports.
Forward your confirmation emails (flights, hotels, cars, dinner bookings) or enter a flight number, and it puts the whole trip on one timeline, works offline, and follows travel day live: check-in desks, gates, delays, security queues, indoor gate-to-gate walk times on tight connections, and baggage belts where published.
Google Play: https://play.google.com/store/apps/details?id=com.tripcoral....
Web app: https://app.tripcoral.com
If you have a flight coming up, I'd love feedback on the UX or anything to make it more useful for travelers!