From NPR:
"We don't really have any great confidence about what a $15 minimum wage would mean, whether across the board or for a particular set of workers," says David Neumark, an economics professor at the University of California, Irvine. In general, he says, raising the minimum wage for workers also raises prices of products and services. … "People buy less from those businesses, and those businesses use fewer workers. And that channel is arguably a lot weaker at airports."
 
Listen in: http://www.npr.org/sections/thetwo-way/2016/01/18/463503921/airport-workers-around-the-country-rally-for-better-wages