SAS quickly realized that the 747s were too large for the traffic load. The −30 series of the DC-10 was developed after joint specifications from SAS and its partners KLM, Swissair and UTA, for a transatlantic variant which could reach the US West Coast. Originally five aircraft were delivered, one of which suffered a non-fatal accident at JFK airport in 1984, was repaired and brought back to service. SAS took delivery of the last seven as used aircraft in 1985–87, when the airline replaced the 747 and introduced increased frequency on the New York services.