BILLINGS - St. Vincent Regional Hospital and Billings Clinic will conduct a training exercise on Thursday.The exercise will begin at about 9 a.m. and end around 12 p.m. It will take place in the Airports Cell Phone lot on Overlook Drive west of the Airport Terminal.According to a press release, multiple emergency vehicles will be operating in the immediate area but should not impede normal traffic.In addition to the hospitals, the other participating agencies will be:- The Billings Fire Department- American Medical Response- Billings Police Department- 911 Center- School District #2- First Student Transportation- City College Medical Careers and EMT students- United Way of Yellowstone County- Billings Clinic Simulation Team- Rocky Vista University- Billings Logan International AirportAlso on Thursday evening beginning at 6 p.m. The Aircraft Rescue and Fire Fighting staff at the airport will be performing an operational exercise that will produce visible smoke above the airport.