A spokesman for RegionsAir said Saturday that the airline was working with the Federal Aviation Administration to resolve a pilot training issue and hoped to resume flights soon.
RegionsAir grounded its AmericanConnection flights between Lambert Field and nine cities on Friday because of the dispute.
The FAA has faulted the airline's system of training pilots.
The RegionsAir spokesman, Nathan Vallier, said some pilots might need to be retrained.
He declined to be specific on when the airline could resume operations but said it could be this week.
The airline serves about 400 passengers daily at Lambert.
RegionsAir is one of three carriers that operate AmericanConnection flights at Lambert. The AmericanConnection flights handled by the two other carriers - Trans States and Chautauqua - are unaffected.
RegionsAir flies turbo-prop airplanes out of Lambert and Burlington, Iowa; Decatur, Ill.; Marion, Ill.; Springfield, Ill.; Quincy, Ill.; Fort Leonard Wood, Mo.; Cape Girardeau, Mo.; Owensboro, Ky.; and Jackson, Tenn.
AmericanConnection is American Airline's regional service.
Vallier said American had canceled the regional service through the end of the month but said flights could be reinstated once the training issue was resolved.
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