Helper column instead of array?

Example attached

I have 2 workbooks and I need one column of data from workbook 1 into workbook 2.

There are 2 criteria I can use (date and flight number) to identify the needed data (customer name).

I have roughly 108.000 rows of data.

I tried an array formula but after roughly 15 hours it was not done and I assume it never will be.

So, any alternatives? I was considering creating a new column in each workbook by combining date&flight number and then use a standard index-match.

Would this work? How would it work?

Any other tips?