Qatar Airways is also going through this turbulent period, like all other airlines in the world. The airline resumed the Doha - Zagreb route in the middle of August, but instead of 9, airline operated only 3 flights on this route this month!
Qatar Airways firstly resumed operations to Zagreb on July 1st with scheduled 3 weekly flights (each Monday, Wednesday and Friday). From 14 scheduled flights in July, Qatar Airways operated only 4 of them, all other flight were canceled. The airline after that canceled this route again and scheduled service resumption for August.
The same case occurred in August as well. Qatar Airways landed in Zagreb on August 12th, with planned 9 flights on this route during this month. The airline operated just 3 flights (on August 12th, 17th and 26th), while other 6 flights were cancelled (including the flight scheduled for August 31st).
The biggest issue for this airline is low demand. Qatar Airways is using the smallest aircraft from its fleet, the A320 aircraft, which has only 132 seats in the passenger cabin. It is obvious that the airline couldn't sell enough seats on those flights to keep them active. The fact that Qatar Airways canceled almost 70% of scheduled flights on Doha - Zagreb route during the July and August is not something that would attract passengers to buy tickets on those flights at the moment.