Average revenue per passenger improved by 5.2 per cent from €69.0 in F20 to €72.5 in F21. Average ticket revenue per passenger decline from €37.7 in F20 to €32.0 in F21 (by 15.2 per cent), while average ancillary revenue per passenger increased to €40.6 from €31.3 (by 29.6 per cent)

Wizz air annual report.

Lots of people spending a little adds up. Poundland for example, small amounts of revenue for each individual product, but millions of transactions add up.