 Concerned that Lorenzo's successful breaking of the IAM would do the same to the pilots' and flight attendants' unions, the pilots represented by Air Line Pilots Association (ALPA) and flight attendants represented by the Transport Workers Union (TWU) called a sympathy strike, which effectively shut down the airline's domestic operations.Non-contract employees, including airport gate and ticket counter agents and reservation sales agents, could not honor the strike.Due to the lockout and sympathy strike, cancelled flights resulted in the loss of millions of dollars in revenue.