Developers flocking to revamp Miami International Airport’s aging terminal could get a bigger piece of the action as officials ponder allowing slot machines in buildings. Plans for the renovation wouldn’t include building until 2017. The long-term concession deal could be central to carrying out the renovation plan, but the gambling concept is in formative stages, Aviation Director José Abreu said. The concept hasn’t been analyzed and the airlines would need a say. Miami-Dade Aviation doesn’t yet have a license for slots. The state is processing a quarter-horse racing application that’s a legal prerequisite.