If you use Google Flights, flights operated by some airlines are annotated with a red note, which is something like the following:
flights operated by this airline are usually delayed 30+ min
I wonder why some airlines (e.g. Aeroflot, Asiana) are more likely to be delayed than others.
At least the Korean Air doesn't have this tag as frequently, so it is not necessarily the problem on the airport, I assume. But I might get it wrong. But there should definitely be a difference.
So what makes some airlines end up in more delayed flights than others? They are not LCC.