I look at the gate numbers at gates and sometimes they are funny like: 24, 25A, 25B, 26. Why is there a 25A and 25B? Why not 24, 25, 26, 27?
Also, which airports in the world use gate 13 as a gate? I know here in the US do not use gate 13 for superstitious reasons. Do other countries follow the same cultural superstition as the US?