sentences:  By the second half of 1958 Keene had become the third largest city in the state to offer passenger service and the second largest to offer air freight service.In May 1961 Mohawk ceased serving Keene with the DC-3 and switched to the larger, more modern Convair 440 for its passenger service into the airport.With the ability to carry 54 passengers, the Convair 440 became one of the largest aircraft to land at Dillant–Hopkins at the time.