Spring break is a carefree time.

Airport security isn’t.

Travel has changed dramatically since Sept. 11, and students  and other travelers  heading off to sunny spots should be prepared.

“Everybody needs to be sure they allow enough time for security (precautions),” said Anne Walters, general manager of Carlson Wagonlit Travel, 800 Mass. “When the airport says allow an hour and a half, they mean an hour and a half. As far as traveling internationally, you should allow yourself two hours once you get to the airport.”

To speed the security screening process, put any questionable items  pocketknives, nail clippers  into a packed bag that will be checked in at the ticket counter.

“I took a hair dryer and a curling iron in my carry-on bag and did not have a problem with them on two major carriers in the last two months,” Walters said. “But if you have a question about whether something you’re carrying will make it through security, just check it.”

She also advises that medication be kept in its original container so security personnel can readily identify it.

“You have to think about it more than you did in the past,” Walters said. “Don’t joke. Security is now extremely serious. Be prepared to be taken aside as a randomly selected individual and to have all of your carry-on materials checked completely.”

As far as packing, think light and take only what you need. If security personnel ask to inspect your bags, it will take less time.

All travelers need to present a photo ID at airports these days. Students traveling out of the country also will need proof of citizenship: a passport or a certified copy (with the raised seal) of their birth certificate.

People under the age of 18, Walters said, must have a notarized letter from both parents allowing them to leave the United States.