I think a better definition is where a company asks for concessions. The company and union then agree, in lieu to cuts to current employees, to treat new employees differently than those currently on the property. These concessions could be pay, benefits, work rules or a combination. It's done generally because it doesn't affect the pilots who would be voting on the concessionary deal. The downside was that these deals fractured the pilot group. This makes it tougher to organize the group years down the road.