"The security measures affect all individuals, global passengers and USA citizens, travelling to the United States from a last point of departure worldwide location", said Lisa Farbstein, a spokeswoman for the TSA.
Passenger Gavin Lai said: "It's a little inconvenient, I kind of just want to get my printed ticket and then just go inside".
The Department of Homeland Security (DHS) announced the new measures created to do away with the carry-on electronics restrictions in June, giving airlines 120 days to comply. And they could be subject to security interviews by airline employees, according to a U.S. government official.
Cathay Pacific Airways Ltd said it would suspend in-town check-in and self bag-drop services for passengers booked on direct flights to the United States.
Air France said it will begin new security interviews on Thursday at Paris Orly Airport and a week later, on November 2, at Charles de Gaulle Airport.
The new procedures do not apply to those who are part of TSA's Pre-Check program, which offers expedited screening for travelers who have undergone background checks.
Lufthansa Group said on Tuesday the measures would be in place by Thursday and travelers could face short interviews at check-in or at the gate. It urged those flying through Dubai International Airport, its headquarters, to allow extra time to check into flights and board.
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Enhanced security screenings began for US -bound flights on October 26.
The measures replace earlier rules that banned travelers from certain countries from bringing their laptops and other large electronic devices into the passenger cabin.
Most say they're ready, and they've had four months' notice.
Airlines that do not meet new security standards could see a laptop ban for carry-on and checked bags imposed, according to DHS.
An airline spokesman said: "We always follow the rules and regulations set out by the USA authorities". In July, the Transportation Security Administration announced rules that require electronics larger than a cellphone be placed in separate screening bins.
So far. But TSA has also stepped up security rules for domestic flights.
New screening rules went into effect Thursday for all US -bound airline passengers that could mean more detailed inspections of carry-on bags and electronic devices, as well as security interviews by airlines employees.