Air Malta registered its 600,000th passenger on the Switzerland route earlier this month.
She was Ms Elain Mathez who arrived with Ms Ruth Zeiter on Air Malta's flight KM483 from Zurich.
Ms Mathez and Ms Zeiter were greeted on arrival by Air Malta personnel who presented them flowers and champagne.
This year also marks the 25th anniversary of continuous direct services by Air Malta between Malta and Switzerland.