Sort order ?

I wonder what the (intended) sort order was here ?

This is the iPhone/iPad app from Austria Airlines...

Is it really that hard ?
How can you sort on the first letter (obviously, because it is sort of grouped by the first letter) but not on the rest ?
The list is neither sorted in English, nor local language, nor the airport codes.

I don't see any sort order here (apart from the initial letter).

Odd.
Stupid.