Mario Kunasek, an Austrian politician and Minister of Defense, self confirmed the date of the next Airpower in 2019, which will be – if it goes well – on the 6th and 7th of September. This was publisehd at the kleinezeitung.at website:

Dass Mario Kunasek an der großen Flugschau in Zeltweg festhalten will, hat der FPÖ-Verteidigungsminister aus der Steiermark seit seinem Amtsantritt schon mehrmals versichert. Mittlerweile steht auch der Termin fest: Die Airpower soll am 6. und 7. September 2019 stattfinden.

The article does mention that there is till no 100% confirmation, several facts – political counterweight, the reorganzation in the Air Surveillance Command (Kommando Luftraumüberwachung), in Slazburg and the Typhoon replacement – could effect the date.

SOURCE