To find the total number of domestic flights, we need to subtract the number of international flights from the total number of flights.
The fraction of airplanes that are domestic flights is:
1 - 5/8 = 3/8
So, the total number of domestic flights leaving Abuja airport each day is:
(3/8) * 192 = 72
Therefore, there are 72 domestic flights that leave Abuja airport each day.