Aer Lingus recorded 699,000 booked passengers during November, a 7pc rise on the corresponding month in 2010, according to figures from the airline.
On its short-haul services, the numbers were up 7.4pc at 624,000, while on services to the United States numbers were 4.2pc higher at 75,000.
The airline's booked load factor -- or the percentage of seats filled -- increased three percentage points to 75.6pc on short-haul services, as capacity rose 4pc.
On long-haul routes, the load factor climbed 3.1pc on unchanged capacity.
The numbers were released as the International Air Transport Association (IATA) warned that a full-blown eurozone banking crisis and a recession in Europe could see the world's airlines lose more than a combined $8bn (€6bn) next year.
For now, the IATA is predicting that combined airline profits in 2012 will be $3.5bn -- less than the $4.9bn it previously forecast.
Aer Lingus Regional -- the service operated by Aer Arann -- had 69,000 booked passengers in November, a 30.2pc year-on-year increase.
Analysts welcomed the figures, which were described as "robust".
The total number of booked passengers with Aer Lingus in the year to date was 9.1 million in November, down 0.2pc on the comparable period in 2010.
Aer Lingus Regional had carried 726,000 passengers in the year to the end of November, up 91.1pc.