In 1983, Continental went to its unions to restructure labor costs to compete with the startup carriers and American's Plan B labor costs. After 19 months of negotiations, the International Association of Mechanics and Aerospace Workers went on strike in August 1983, even though the company was offering 20 percent pay raises in return for substantial productivity improvements. Continental was able to operate through the strike because many mechanics crossed picket lines and Continental hired new mechanics. The company continued to negotiate with the pilots and flight attendants and management gave a final proposal to its pilots in mid-September, which would have provided ownership by the pilots and other employees of 35 percent of the company's stock in return for meaningful wage and productivity changes. With no agreement, Continental filed Chapter 11 bankruptcy on September 24, 1983 and shut down for three days.