The U.S. State Department is warning American travelers to be careful.
They just issued a World Wide Travel Alert over fears terrorists could strike again.
The warning comes just days before one of the busiest travel weekends of the years as millions of Americans get ready to see loved ones this Thanksgiving.
At Orlando International Airport officials say they expect a 5% increase of air travelers compared to last year's holiday.
The State Department says terrorist groups and individuals "continue to plan terrorist attacks in multiple regions."
It goes on by saying "U.S. citizens should exercise vigilance when in public places or using transportation. Be aware of immediate surroundings and avoid large crowds or crowded places. Exercise particular caution during the holiday season."
1.3 million travelers are expected to travel through OIA this holiday season starting now through December 1st.
The Executive Director of OIA says the busiest day will be the Saturday after Thanksgiving.