9m passengers use NI airports in 2018
Nearly nine million people travelled through Northern Ireland's airports in 2018.
That is an increase of almost 29% since 2013.
Two million more passengers used Belfast International alone in 2018 than in 2013.
At George Best City airport, there was a fractional drop in passenger numbers between 2013 (2.54 million passengers) and 2018 (2.51 million passengers).
Meanwhile, the number of passengers using City of Derry Airport has halved over the last five years.
Air Passenger Tax
Overall, more than 6.2 million travellers used the international airport in 2018, according to the Civil Aviation Authority figures.
"Increasing our passenger numbers by more than 2.2 million in just five years is an impressive achievement," a spokeswoman for the International airport said.
"Of course, much more could be achieved without the burden of Air Passenger Tax (APD) and we will continue with our campaign to get rid of this hugely unfair tax that places Northern Ireland airports at an enormous disadvantage to the Republic of Ireland where no similar tax applies."
Figures show that between 2013 and 2018, the numbers using the council-owned City of Derry Airport have fallen from nearly 385,000 in 2013, to nearly 186,000 in 2018.
An airport spokeswoman said the decline is a result of reduced capacity following the withdrawal of Ryanair's London-Stansted service.
The Irish airline formerly operated a route between the airport and Stansted but axed the flights in March 2017.
"Operations of a double daily public service obligation route to London-Stansted commenced in May 2017, offering more frequency to London-Stansted but less capacity than the previous operator," she said.