MARCO WERMAN: Some might say it's better to measure progress in Afghanistan one small step at a time. Here's an example. This week the country's national airline flew one of its planes with 40 passengers on board from Kabul to Lashkar Gah. It was the first commercial flight between those two places in 20 years. Lashkar Gah is the capital of Helmand province and as we heard a few minutes back Helmand is one of the most dangerous provinces in the country. It's also the main source of Afghanistan's opium and heroin production. By the way the Lashkar Gah airport for US and British troops in Afghanistan. They've been using the airport for years even when civilians did not.