Thank you Einheitsdesign!

I browsed earlier messages to figure out what are sources that you guys are using. I managed to figure out quite a few missing tail numbers based on ACARS records. But now it seems I hit the wall again and would ask further help from experts.

Is there any source to find out what which flight took place HEL-BUD on 27.1.2002? And return BUD-HEL on 27.7.2002? Of course the goal is to figure tail numbers but even possible flights would be nice.

Also same question for flights HEL-KAO on 4.7.2003 and KAO-HEL 6.7.2003? These where most likely AY flights with ATR 72.

I have also other missing flights but these are at least to me hard ones due lack of data.