WASHINGTON — About 300 airline pilots and flight attendants joined union officials and lawmakers from both parties in front of the U.S. Capitol on Wednesday to support the creation of the world’s largest airline.The $11 billion merger of American Airlines and US Airways was on its way to completion by year’s end until the Justice Department, joined by six states and the District of Columbia, sued last month to block it.In its complaint, the Justice Department’s antitrust division says the merger would be bad for consumers, leading to reduced competition and higher fares. The case is scheduled to go to trial in federal district court in November.The unions representing airline employees support the merger, and they took that message to Congress on Wednesday, holding signs that read “Let Us Compete Together” and chanting, “DOJ, say OK!”“We are going to get this done,” said Laura Glading, president of the Association of Professional Flight Attendants. “The merger will happen.”Glading said she and other union leaders met with Bill Baer, the Justice Department’s antitrust chief, and his deputy, David Gelfand. Several lawmakers are drafting a letter to President Barack Obama requesting that Attorney General Eric Holder drop the antitrust complaint.Echoing a frequent criticism leveled at the Justice Department lawsuit, James Ray, communications chairman for the U.S. Airline Pilots Association, ticked off three major airline mergers the government had approved in recent years and questioned why this one is different.“Why is it that the same government that deregulated this industry 35 years ago decided to re-regulate it today?” he said.Where the Justice Department sees an airline colossus that would raise fares and baggage fees, eliminate competition on some routes, and dominate takeoff and landing slots at Ronald Reagan Washington National Airport, the airline employees see a stronger company that would provide more job security and would better compete with large airlines such as Delta and United.“This was an employee-driven merger,” said Kazumi Chapa, a flight attendant based at Dallas/Fort Worth Airport. “We want to survive.”Gary Chaison, a professor of industrial relations at Clark University in Worcester, Mass., said it’s unusual to find such strong employee support for a big merger.Chaison said the unions representing the two airlines — which have been battered by terrorist attacks, recession and high fuel prices — want stability and certainty.American employees have a lot at stake: The merger is the company’s plan to emerge from Chapter 11 bankruptcy. Last week, a federal bankruptcy judge in New York approved the deal.Cities where the airlines have a major presence anxiously await the merger’s conclusion, and lawmakers from districts with airline hubs rallied alongside the pilots and flight attendants.“Don’t you think it’s time we recognized that this merger’s important for Charlotte, for Dallas, Philadelphia, and every other city to help create jobs?” asked Rep. Robert Pittenger, R-N.C.“I’m especially proud that American Airlines will maintain its headquarters in North Texas,” said Rep. Marc Veasey, D-Fort Worth. “Finalizing this deal means job security for over 24,000 Texans.”The combined company would be based in Fort Worth. However, Texas is one of the states that joined the Justice Department’s lawsuit.American EagleNot everyone at the rally supports the merger. American Eagle flight attendants, wearing bright-green shirts in a sea of dark-blue uniforms, questioned how the merger would benefit employees of American’s regional airline subsidiary.“We have no idea what the future is for us,” said Mary Oswald, a Chicago-based Eagle flight attendant.Eagle’s future in the new American is uncertain. The parent company discussed selling the regional carrier before it filed for bankruptcy in November 2011. American Eagle pilots and flight attendants were asked to accept contract concessions as part of the restructuring.Oswald said that despite promises of growth, American Eagle hubs have been closed and some jobs have been outsourced to other airlines.