A record of almost 77,000 passengers were carried by African budget airline Fastjet from its Tanzania base in August.
The 17.2% increase in passengers was partly due to new routes to Malawi introduced in July and increased frequency on other services.
The load factor for August was 75%, down three percentage points from the same month last year as capacity rose by almost a quarter.
A total of 88% of flights arrived on time but punctuality dipped over July, mainly due to unexpected airfield closures in Dar es Salaam for military training, according to the airline
Chief executive, Ed Winter, said: “We are delighted to report record monthly passenger numbers for the second consecutive month, further affirming the growing appetite for low-cost aviation across southern and eastern Africa.
“August is traditionally a strong month but with a capacity increase of 23% versus August 2014, we are delighted to maintain such strong demand.”