Brussels Airlines is the main airline of Belgium, and it carried 23.6 million passengers in 2024. This makes it one of the world’s smaller flag carriers, and it is dwarfed by KLM, the flag carrier of Belgium’s northern neighbor, the Netherlands. KLM carried around 98 million passengers in 2024. Both airlines are overshadowed by Europe’s ultra-low-cost giant, Ryanair, which carried around 200 million passengers that year.