If all legs of your flight are operated by one carrier, your baggage is checked in to your final destination. This means that when you change planes, you don't have to collect it and check it in again for your connecting flight.
You will need to check in again and drop off your baggage if:
- There is passport control at the connecting airport.
- Your booking contains several tickets from the same or different airlines.
- You need to change airport at the connection city.