Your journey
Chain your flights together and see whether the connections actually work — using live estimates, not the printed schedule.
Example: ORD → ZRH → BCN → LEN — the 25–26 July trip.
Why this exists
Every tracker will tell you a flight is late. None of them tell you whether that means you still make your onward flight. This does the arithmetic with live estimates, states which airport publishes gates early enough to matter, and is explicit about what it does not know.