The Swearingen Metro was essentially a stretched Merlin corporate transport. For many years, it was the only pressurized aircraft built for the commuter airline market. Earlier models were limited by regulations to 12,500 lbs fully loaded. As a result, the early Metros were severely weight-restricted. In 1980, weight restrictions were raised to 14,000 lbs, and Swearingen immediately began work on the Metro III. Midstate was an early operator of the Metro III
METRO III