"It's scary. It makes my heart pound just to even think about the what-ifs," said one woman who sat on the airplane on the runway for two hours.

Once the airport reopened, travelers we allowed to get retrieve their luggage.

Authorities said travelers should stay in contact with their airlines about flights. They said it was up to the airlines whether to continue flights Tuesday night.

"A lot of people, you know, they are a little upset," one shuttle driver said after the evacuation. "Their nights have been up and down. A lot of people have been flying all day and they are trying to figure out how they are going to get home to the kids and the families and things like that. So we are just trying to help, just breathe easy, just get them wherever they can go, get them there safely as soon as we can. Anyone who needs assistance we will help."

MORE LINKS:

TSA Federal Air Marshals
Airport safety inspection
Federal Aviation Administration
Airport diagram
Air traffic audio feeds