Thank You, Jim!
In the meantime a Estonian friend pointed out that Heeresgruppe Nord had some sort of Commander HQ at Werro (Vőru):
http://www.lexikon-der-wehrmacht.de/...bietNord-R.htm
So we have to adjust the time period probably winter 1942-1943? As there is only two Ju 52s in the photo perhaps my wording "airlift" was an exaggeration.
Cheers,
Kari