Has the war on terror become its own barrier to trade?

From my point of view, it is definitely true. As the case mentioned, the nation's transportation companies increased a lot of costs associated with preventing terrorism attack. In addition, numbrous transportation delays have accompanied with the security check. It is an absolute loss for those companies in the United States because they have to deal with the added costs. Generally speaking, it is no doubt that the added costs will be transferred to the customers or outside partners. However, it will result in decreasing willingness for other outside companies to team up with the U.S. companies. In other words, the trade barriers apparently exist after 911 terrorism attack.
But, from the point of Government view, it would be the first important emergency response which they have to implement well. It is because they could not even afford a second similar attack that will dramatically shock down the global trade business of United States. Moreover, the tourism industry which U.S. relys on a lot would affect adversely as well.
In conclusion, I think the associated delays and costs for preventing terrorism threat are much worth than it should be. However, I rethink that might be the only way for U.S. to win back its reputation and the confidence of international companies.