Missing data for flights from/to LOWK (Klagenfurt)

Hi,
I have been using the opensky IMPALA database to query various flight data of Austrian airports, but unfortunately, I have noticed a significant lack of information for flights to and from Klagenfurt (LOWK). Even more specifically, the scheduled flights operated by Austrian Airlines (for example with flight codes AUA937%, AUA941%, AUA942%, and AUA938%) appear to be completely missing or extremely limited.

I have tried multiple queries and attempted various date ranges, but the data seems to be unavailable.
Is anyone else experiencing this issue or aware of the reasons behind it? Your insights would be greatly appreciated!

Thanks,
Florian

Thank you very much!
Yes, I am familiar with the issue of Arrival and Departure airports. (
But does this fact also explain that I can't find the flights when I search with the callsign? (%)

Okay - thanks!
Do you have any idea for kind of a workaround to find these flights?

I have now found the flights. I followed your suggestion - identified the icao24 code on Flightradar and started a query with it in the Impala database. (for different times).
After that I was able to identify the used callsigns.
Reason for the not working destination/departure recognition might be simply a poor coverage of the area - see screenshot (the airport is north of the city ).

Unfortunately I don't know anyone in the area who could host a sensor