It's a concern for the U-S government ... airlines... and anyone who flies: Determined terrorists, potentially using old methods -- in new ways -- to bring down planes. 3 There's a serious, new warning that all parties are paying attention to. Airlines are being warned of a possible shoe-bomb threat. Although national security leaders say there's no SPECIFIC threat -- they want airliners to be on high alert. Channel 4's Tim Pulliam is live at Jacksonville International Airport with more on how this could this impact your next trip to the airport. 3 More security searches and screenings: A likely possibility throughout the nation's airports and here in Jacksonville following a message from the Department of Homeland Security - urging foreign airliners headed to the U.S. to be on the lookout for possible bombs stuffed in passengers' shoes or carry-on bags.MB 083833 I want to be safe.It's unfortunate price to pay for safety Marla Banks says.The Texas native and frequent business traveler says she is usually able to get through the Transportations Security Administration's pre-check line without removing any personal items - But that was not the case this week.Re Marla Banks/ Frequent Traveler headed to Atlanta then on to Texas 083855 I didn't know about this, I had to take my shoes off yesterday in Atlanta. I wasn't told why. I did tell them I have TSA clearance, but they said yeah that has been scaled back at this time. So I took my shoes off.It's a heighted caution with no real threat according to intelligence officials. Since 9/11, airlines have been a target for terrorists.Just weeks after attack, on a flight from Paris to Miami, Richard Reid was caught attempting to set off a shoe-bomb.Frequent travelers tell us the potential threat means having more patience going through security.Todd Bell/Frequent Traveler headed to Pennsylvania here on business. Travels every week. 083527 No big deal. I'm not worried about it at all. Christine Kizziah/Freq uent Flyer..084343 You stress about the things that you control and this is one thing that you cannot. 3 Tim - Is Jacksonville International Airport doing anything specifically because of the warning?Answer No. A spokesperson says Aiport police has not received any specific threats and will continue to their current security plans that are already in place.