GREENVILLE, S.C. -- The recently foiled terrorist plot to blow up an airplane on Christmas Day has led to an increase in security at airports around the world.

Despite that increase, many passengers at the Greenville-Spartanburg International Airport said they have not noticed much of a change.

A couple who flew into GSP from Phoenix on Monday said they were not treated any differently from when they flew out of the airport before last Friday.

Experts said that local airports will not see a major change in the screening process. They said that most of the changes will be seen at airports that are overseas with flights that are bound for the United States.

The Transportation Safety Administration has said it plans to add additional security measures at domestic airports as the need arises.