DALLAS (AP) — Enjoy lower airfares while you can. Airlines are taking steps to push prices higher by next year. Fares have been dropping for more than a year. Taking inflation into account, the average round trip within the U.S. in late 2015 was the lowest since 2010.adcelannotate = {"mobilepaywallcategory" : "MOBILE_PREM-BUSINESS","nativepaywallcategory" : "NATIVE_PREM-BUSINESS"};