DALLAS (AP) - Southwest Airlines mechanics have approved a five-year contract that adds up to a 20% raise.

Dallas-based Southwest on Tuesday announced the tentative agreement with about 2,400 workers represented by the Aircraft Mechanics Fraternal Association. Both sides in March announced they'd reached a tentative deal.

The agreement, which also calls for $160 million in bonuses, comes after six years of negotiations. Union officials say 94% of workers voted in favor of the proposal.

A Southwest statement says the new contract will become amendable in April 2024.

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