US low-cost carrier Allegiant Air has posted a 4.1% decline in passenger revenue per available seat mile (PRASM) for May.
The carrier posted a 21.2% growth in passenger traffic for its scheduled services during the month.
Capacity grew 25.3%, which led to a three percentage points decline in the load factor to 89.2%, says the airline.
Passenger numbers in May increased 18.8% to 515,000.
Allegiant expects its scheduled capacity to grow 9% in June and for capacity in the second quarter to rise by 19% to 21%. For the third quarter, it estimates that its scheduled capacity will grow by 15% to 19%.