Which Riverside airport was this? I'm guessing KRAL.
KRAL Riverside, CA, USA Riverside Municipal Airport
KRIV Riverside, CA, USA March Air Reserve Base Military
KRIR Riverside/Rubidoux, CA, USA Flabob Airport
K32 Wichita, KS, USA Riverside Airport
54CL Anza, CA, USA Lake Riverside Estates Airport Private
OH36 Zanesville, OH, USA Riverside Airport Private
52CA Riverside, CA, USA Lake Mathews Airport Private
OG34 Tigard, OR, USA Meyer Riverside Airpark Private
NC00 Sanford, NC, USA Moretz Riverside Landing Airport Private
54VA Newport News, VA, USA Riverside Hospital Heliport Private
CA81 Riverside, CA, USA Riverside Metro Center Heliport Private
9OI9 Columbus, OH, USA Riverside Methodist Hospital Heliport Private
6MO7 Ozark, MO, USA Riverside Landings Airport Private
ME85 Dover-Foxcroft, ME, USA Riverside Seaplane Base Private
4WA8 Deming, WA, USA Riverside Airport Private
22GA Plainville, GA, USA Riverside Airport Private
9MN4 Minneapolis, MN, USA Fairview Riverside Medical Center Heliport Private
10IL Kankakee, IL, USA Riverside Medical Center Heliport Private
VA70 Gloucester, VA, USA Riverside Walter Reed Hospital Heliport Private
8MD6 Riverside, MD, USA Burgess Field Airport Private
ID12 Riverside, ID, USA Russell W Anderson Strip Airport Private
CA91 Riverside, CA, USA Johnson Heliport Private
CA78 Riverside, CA, USA City Hall Heliport Private
4OI5 Toledo, OH, USA Riverside Hospital Heliport Private
06KS Wichita, KS, USA Riverside Hospital Airlift Heliport Private
5WI7 Waupaca, WI, USA Riverside Hospital Heliport Private