If you're travelling by air soon, you'll see lots more security measures at airports - including high-tech full body scanners.
Security is being tightened in lots of airports after a man tried to blow up a plane in America on Christmas Day.
The scanners can see through clothes, making it easier to search for things that might be dangerous.
They are being brought in as soon as possible, but not all airports will have the scanners.
Not everyone will be scanned, and it's not been decided how passengers will be chosen for scanning.
But some people say the scanners aren't very good.
Some experts reckon they might not have been able to detect the bomb allegedly used in the attack on Christmas Day.