Associated Press: Fifteen airlines and air cargo carriers said Tuesday they’ve signed memorandums of understandings that could lead to the purchase of hundreds of millions of gallons of fuel made from either coal or camelina, a weed that’s a cousin to canola. The Air Transport Association said airlines from the United States, Canada, Germany and Mexico have signed memorandums with AltAir Fuels LLC of Seattle, which contemplates producing about 75 million gallons of fuel a year from camelina or similar …