A Delta Airlines McDonnell Douglas MD-90, registration N955DN performing flight DL-1817 from Atlanta,GA to Denver,CO (USA) with 152 passengers, was enroute at FL300 about 80nm north of Tulsa,OK when a 12 passengers reported feeling unwell prompting the crew to divert to Tulsa for a safe landing about 20 minutes later. Several medical units responded, 9 passengers needed medical treatment.
