BUENOS AIRES - An Argentine commercial plane crashed in the country's remote Patagonian region late on Wednesday, killing all 19 passengers and three crew members on board, the director of a local hospital told reporters.The plane, operated by regional airline Sol, sent an emergency call at 8:50 p.m. local time and was not heard from again, a statement from the company said."No one was found alive," Ismael Ali, director of the Los Menucos hospital in the southern Argentine province of Rio Negro told local television.