Airlines' efforts to help the US government manage long airport security lines are not sustainable, the CE of American Airlines Group said. American, Delta and United Continental have each added US$4m to what they typically spend on workers who stock bins at checkpoints and take care of tasks other than screening, which is handled by the US TSA. This, however, is not a solution to waits that have caused more than 70,000 of American's customers to miss flights this year, CEO Doug Parker said Wednesday in New York. The TSA must add enough staff to handle checkpoints on its own during peak travel times, he said. Recently, the agency has relied on airlines to handle some of its non-screening work. The remarks underscore airlines' concern that fewer people will book flights if lengthy airport waits continue. "I checked into Dallas-Fort Worth on the way out here, and we have - it appeared - at least as many American Airlines employees standing out in front of security helping move the lines as there are TSA agents," he said. "That's neither right nor sustainable." Parker said a staffing shortage at the TSA, not fuller planes, has caused the crisis. A spokesman for TSA declined to comment.<br/>