Notes: *Aircraft operation estimates reflect activity measured after normal ATC operating hours. This activity, when combined with ATC traffic counts results in a slightly higher total aircraft operation count for that airport, when compared to ATC reports. In addition to the above figures, Lambert-St. Louis International Airport had 5,364 general aviation aircraft operations and MidAmerica Airport in
Illinois had 1,044 general aviation aircraft operations The region shows a (1.4%) decline in operations in the first quarter of 1999 compared to the first quarter of 1998. Both Lambert-St. Louis and Mid America general aviation aircraft operations declined during the first quarter of 1999 by (11.9%) and (56%) respectively from the same period in 1998. St. Louis County continues to increase aircraft operations. Creve Coeur, with a new
runway, increased aircraft operations by 97.6% during the first quarter 1999 compared to the same period in 1998. Spirit of St. Louis indicates a slight gain of 3% during the first quarter of 1999 compared to the same period in 1998. Festus Memorial Airport in Jefferson County, Missouri, while not in the NPIAS, showed a 34% increase in aircraft operations during the first quarter of 1999 compared to first quarter 1998 data. In Franklin County, Missouri, aircraft operations
at Sullivan and St. Clair airports increased by approximately 57.8% and 38.5% respectively, while Washington Memorial indicated a (20%) decrease in aircraft operations between the first quarter of 1999 and the first quarter of 1998. In St. Clair County, Illinois, aircraft operations at St. Louis Downtown-Parks Airport increased by 0.3% from the same period last year. Acoustical counter measurements during the first quarter of 1999 estimate Parks had 4,490 aircraft operations
during periods other than normal ATC operating hours , an increase of 21% from the same period last year. In Madison County, Illinois, both Shafer Metro-East and St. Louis Regional Airport declined from last year by (4.7%) and (65%) respectively. | 
