Housekeeper Melvin Edwards spot mops just outside the A Concourse Checkpoint.

When it comes to safety, a mop is one of the key tools on the frontline. They’re in use 24 hours a day in the terminal and concourses at Lambert-St. Louis International Airport. More than 100 Airport Authority housekeepers and contracted cleaning staff work to keep terminals and concourses clean. This time of year, it’s a hard job. That’s because of the winter weather. Thousands of passengers and visitors a day track in moisture from snow, ice as well as chemicals. It’s a mix that creates hazards on the Airport’s hard floor surfaces. Until it’s mopped clean. Houskeepers also tackle food, beverage and other spills to make sure the public has a safe path around the through the Airport.