Airports across the US will see alert-raising measures
Spokesman Tony Snow said there was no indication of a specific threat to the US, and no change to the country's overall security level.
But he said the security presence at airports would be reinforced for the sake of vigilance.
Travellers are being told the measures could cause some delays.
On Saturday, a blazing car was driven into the main terminal building at Glasgow Airport.
It came a day after two cars were found containing explosives in central London.
Mr Snow said the Transportation Security Administration (TSA) would carry out some "alert-raising measures" at airports across the US.
"You are likely to see those in the increased presence of some TSA agents outside terminals, there will be some inconvenience to passengers in terms of longer wait times," he said.
"It's important to know that we remain committed to being vigilant throughout the country, including at airports."
JFK Airport
According to reports, a terminal at John F. Kennedy International Airport located in New York, New York was evacuated after authorities found a suspicious package outside the main American Airlines terminal.

Reports say that the package was found outside the terminal on a street curb just before 10:30 a.m. (eastern time), and turned out to be men's cologne.

"There was a suspicious package that was found at 10:20 a.m. curbside at Terminal 9, which is American Airlines. It turned out to be a package containing cologne," said Steve Coleman, a spokesman for American Airlines.

At approximately 11:35 a.m. (eastern time) authorities began to let passengers back into the terminal, giving it the all clear.

No flights were affected by the incident.

The United States had raised the presence of police and bomb sniffing dogs at airports across the U.S. after a terrorist attack in Glasgow, Scotland.