Travelers at Lindbergh Field are feeling the change in security after two incidents over the weekend.
On Friday, a man tried to blow up an airplane bound for Detroit in a suspected terror attack. Then on Sunday, on the very same flight, a man locked himself in a restroom for more than an hour, according to authorities.
With the national threat level at orange, people told us about more screens, more searches and more police before they got on the plane.
While it didn't slow them down very much, they said it made them feel safer.
One women was screened by a machine she had never seen before.
“You stand inside of an enclosed space and you have to spread your legs, put your arms up, and there's a machine that goes around your body to check that you're not carrying anything that you shouldn't be,” San Diego Resident Jaynie Hartman said.
She also says her carry-on bags were searched even after going through security lines.
“The bags that were going on the airlines were being checked again as we were getting on board so there was definitely a heightened security I noticed,” Hartman said.
Others noticed a greater police presence.
“There were cycled mountain bike police in the international terminal in San Francisco. and that you don't usually see,” San Diego Resident Sean Toland said.
While most agree that getting an explosive on a plane is a serious problem, experts say many airports don't have the money to upgrade their security systems.
“They can't tell explosives. A lot of them cannot detect chemicals so you're going to get what you pay for,” National Security Expert Abraham Sofaer said.