The C24 forms a signed route between Crumlin and Antrim, heading west around Belfast International Airport. Parts of it were formerly the A26. The northern sections have become part of the A57. There are possibly several spurs into the Airport site. The current route starts on the A52 in Crumlin and heads north westwards, passing the C22 at a crossroads and turning left at the next crossroads where the road ahead is the C110. The road works its way around the west side of the airport before splitting: one spur heads east to meet the A57 at a mini roundabout marking the airport's entrance and the other continues north east to meet the same road a few kilometres south of Antrim.