On July 28, Azerbaijan Airlines (AZAL) Airbus A319 (aircraft registration 4K-AZ05) performing flight J25095 to Karachi returned to Baku for some technical reason. The aircraft departed from Baku at 9:26 PM and landed safely on Baku Airport Runway 34 at 10:33 PM i.e. 1 hour 7 minutes after takeoff. The aircraft also flew holding pattern for about 37 minutes before landing in Baku.

Source:
flightradar24.com
Later, Azerbaijan Airlines Airbus A320neo (aircraft registration 4K-AZ143) as substitute aircraft left Baku at 1:05 AM on July 29 as flight J25095 to Karachi.

Source:
flightradar24.com
On July 28, Azerbaijan Airlines flight J25095 to Karachi was scheduled to leave Baku at 9:15 PM
Abbas