Flight diversion

Kind of an easy question but how can you tell if a plane has diverted to another airport or returned to another airport?

Sorry still getting used to site

thanks

flightaware.com/live/diversions

We’ll note it in the activity log at the bottom of the aircraft’s page.

I don’t think this is a diversion, but I don’t know where else to put this. Anyone know what could have happened here??
flightaware.com/live/flight/THY1 … /KLAX/LTBA
and here’s the log: flightaware.com/live/flight/THY1 … A/tracklog

FL 370 to FL 330, then 4 seconds later back to FL 370 only to drop back down to FL 330.

Data for flights outside of the USA are less reliable than within the USA. At the bottom of the map is this notation:

At least part of this flight occurs outside of FlightAware’s primary service area.

Data for flights outside of the USA are less reliable than within the USA. At the bottom of the map is this notation:

I know that, I was looking at the part from where it took a path that had it heading over the Hudson Bay to east over Maine, then back up over Labrador.

Hudson Bay is outside of the USA.

Given the offset in the tracks it looks like two flights in the air at the same time both tagged as THY10.