It is a detail that tells the reader more about Mexican culture.
to emphasize a dangerous situation
smd
If someone refuses to take their shoes off in an airport, it is likely that they could be in serious trouble. They will not likely be allowed to get on a plane, and they may be kicked out of the airport, or even arrested.
To emphasize a dangerous situation. -Apex
Dallas
Most likely, 'schedule'.
Most likely called "the Orlando Airport Shuttle" - they can be quite subtle sometimes.
most likely Cairo airport
Most likely Lisbon International (LIS) or Faro (FAO).
Most likely at a major airport or at some banks.
Most likely because of the Wind and it's speeds
Most likely from moisture. If you are mopping the floor, steam cleaning it, or using any kind of water (even a little) it can swell the joints. It also could be from moisture in a cement slab if its on one.