Louisville International Airport road crews are working around the clock to keep runways clear. But spokeswoman Trish Burke says their job is about to get more challenging.“The addition of ice to the mixture of ice to a winter storm is very difficult as everyone who works on roadways and other facilities is well aware of," Burke says.Burke says 24 flights – both outbound and inbound – have been cancelled today. And there have been delays of more than an hour and a half. Burke says travelers should double check their flight status before leaving home because the impacts of this storm are still unfolding.