A proposed $500 million cargo airport southeast of San Diego could bolster the area's manufacturing sector, but opposition to the airport is growing.
With passage of the North American Free Trade Agreement and the economic expansion of the late 1990s, the San Diego-Tijuana metropolitan area has become a major manufacturing hub. Factories on either side of the border turn out clothes, televisions, appliances, parts and other items.
However, distributing the products to markets, or to final ass...