TULSA, Okla. (AP) — Mechanics and stock clerks at bankrupt American Airlines approved new labor contracts Wednesday, but union officials conceded that the vote won’t prevent hundreds of workers at the airline’s Tulsa maintenance hub from being laid off.

The Transport Workers Union said its mechanics group voted in favor of the new contract, which comes with 3 percent raises, by a razor-thin margin of 50.25 percent to 49.75 percent. The maintenance stock clerks voted 79 percent to 21 percent to accept their contract with a 3.5 percent wage increase.