FRANKFURT, Germany: Air Berlin PLC, Germany’s second-largest airline, said Wednesday the number of passengers who traveled with it in April rose 6.5 percent to 2.24 million passengers, compared with 2.1 million passengers a year earlier.

The airline’s capacity utilization rose by 4.5 percentage points to 78.8 percent, compared with 74.3 percent in April a year ago. Capacity utilization is a measure of how full airplanes are.

The Berlin-based airline said in the period from January through the end of April, the number of passengers increased nearly 10 percent to 8.1 million passengers, compared with 7.4 million in the same period last year.

The airline’s capacity utilization in the first four months increased by four percentage points to 74.7 percent.