Today marks the start of increased security measures imposed by the U.S. Transportation Safety Administration for all flights departing for the United States. According to TSA, these measures will affect approximately 2,100 flights daily.

The stricter screenings will affect over 300,000 average daily passengers traveling on 180 different airlines from 280 airports in 105 countries.

These measures will include enhancing overall passenger screening, conducting heightened screening of electronic devices and increasing security protocols around aircraft and passenger areas.

Some travelers have already noticed a difference. Kenneth and Margaret McGough were questioned by airline staff before they traveled directly on Virgin Australia from Melbourne to Los Angeles.

(Anthony Ciardelli/Annenberg Media)
(Anthony Ciardelli/Annenberg Media)

"There was a little bit extra than what there normally is, but it didn't worry us," said Kenneth McGough. "We had to give the address of our first night's accommodation and provide a flight itinerary."

You-Jin Choi, a passenger traveling from Seoul, also experienced enhanced screening at her departure gate.

"They questioned me if anyone asked to carry any extra packages to the states," Choi said.

While some airlines like Qantas and Virgin Australia have already complied with the new measures, other international air carriers are beginning their enforcement today, including Air France, Cathay Pacific, EgyptAir, Emirates and Lufthansa.

When the new policy was announced in June, officials from the U.S. and Europe said that airlines had 120 days to comply with the deadline.

The Department of Homeland Security said that airlines who do not comply with the increased security measures by the deadline may have additional restrictions imposed on their passengers.

The new rules were created, in part, to end the U.S. restrictions of small electronic devices on planes originating from 10 airports in eight Middle Eastern and North African countries.

In a statement, the TSA said: "The United States and the global aviation community face an adaptive and agile enemy. Terrorists continue to target commercial aviation, and the United States continues to work with our partners to raise the baseline of global aviation security and keep the entire traveling public."

Some passengers say this heightened security risk justifies stricter screening.

"I don't see a problem with it," said Richard Loehnig, who arrived in LAX from Shanghai. "People are coming from all over the world."

Though many airlines have complied with the TSA's new requirements, there has been opposition. Companies like China Airlines and Korean Airlines voiced concerns about inconvenience to passengers.

In an interview with Reuters, President and COO of Korean Airlines, Walter Cho said, "We are asking customers to show up at the airport early…It's just inconvenient for the passengers."

Royal Jordanian Airlines, who was granted a delay on imposing the new security regulations by U.S. authorities, said it would comply by mid-January.

Some passengers do not have faith in increased screening, especially extra questioning by airline officials, no matter when they take effect.

"I think the whole system the way it's set up, it's a little aggressive in general," said Johnathan Cowen who traveled from Seoul to LAX. "I would say if you had a half-a-brain and you were planning what you were going to say before you came here, it's just questions, people lie all the time about everything."