Planes four times larger than previously allowed now can land at Lee Gilmer Memorial Airport in Gainesville, a move that some believe could boost economic development. Following up on the results of a $25,000 study, the airport has raised its maximum weight load of aircraft to 100,000 pounds dual-wheel from 20,000 pounds single-wheel, airport manager Terry Palmer said Thursday. “I would have been pleased with 70,000 and ecstatic with 80,000,” Palmer said.