Boeing firefighters ratified a new contract with major pay increases and expect to return to work this weekend after a lockout that has lasted more than three weeks, their union said Thursday. The deal covers about 125 fire and emergency-service workers in the Seattle area, who were locked out by Boeing when their previous contract expired May 4. The vote was 86-24 to ratify a tentative agreement, according to Local I-66 of the International Association of Fire Fighters union.