Hello, in Brussels there are 2 airports, Brussels and Brussels Charleroi. When I only want to see flights from Brussels airport, since the code of the airport BRU is the same as the city BRU, it still shows all flights from both airports.
As you see in the screenshot, I am only selecting Brussels Airport, but the first option is from CRL airport.
Great website, thanks a lot!
FYI: Same thing happens with Oslo (Oslo Gardermoen OSL and Oslo Torp TRF).