Passenger traffic is on the rise at Lambert Airport in St. Louis.
Airport officials said Wednesday that traffic rose 2.5 percent in April compared with April 2012. About 523,000 people boarded planes at Lambert last month.
For the first four months of 2013, Lambert traffic was up about 1 percent with about 1.95 million passengers boarding planes.
The number of total passengers, both arriving and departing, was up 2.1 percent in April.