TSA says they want to keep the changes vague so that passengers don't expect the same thing all the time.
Some passengers feel this might be a way of inconveniencing them and say it doesn't make flying anymore secure.
It has been a rollercoaster ride for airline passengers who now find themselves bombarded by new security measures.
The changes come after a 23-year-old Nigerian man with purported ties to al Qaeda allegedly tried to blow up an airliner on Christmas Day.
"I'm concerned, but I've decided to trust the system and hopefully they will learn from their mistakes," Elliot Kozer said.
It's up to individual airlines to enforce the suggestive TSA precautions.
Among the precaution, once the flights take off, airlines have the option of taking the following precautions:
Some passengers think it's gone too far.
"This wasn't the fault of any American workers. This was the Dutch and we're being penalized for their mistake," Christian Malec said.
In Amsterdam, where the Christmas bombing suspect was screened before boarding the Delta-Northwest flight to Detroit, officials announced they will start using body-scan machines to screen everyone flying to the U-S. The controversial machines are designed to detect suspicious items that metal detectors could miss, but critics say they provide a too revealing image of a passenger's bodies.
"I think the body scanner should be at every checkpoint in every domestic and foreign airport that has a plane bound for the United States. They've got to have security measures that are consistent with reality," said James Thompson, a former 9/11 Commission Member.
Already 19 US airports are using body-scan machines, and dozens more will get them in the next two years.