Since first being settled, East Hartford's economy was primarily agricultural, with tobacco being the main crop. All that changed in 1929, when Frederick Rentschler, head of the new Pratt and Whitney Aircraft Company, moved production from Hartford to a sprawling 1,100 acre (445 ha) site in East Hartford. The grounds included a small airport called Rentschler Field that was in service from 1931 to 1999. It was originally used for test flights and maintenance operations, and later for corporate aviation. The 75-acre (30 ha) site was decommissioned as an airport in the 1990s, and donated to the state of Connecticut by United Technologies in 1999, and a new Rentschler Field opened as a stadium with capacity of 40,000 people. Pursuant to a lease agreement with the State, UConn plays all its home football games at Rentschler Field.On July 16, 2015, it was announced that the stadium had been named Pratt & Whitney Stadium at Rentschler Field in a deal between Pratt & Whitney and UConn. The playing surface is still named Rentschler Field.