Key TakeawaysBoeing and its largest union partner are resuming contract negotiations under federal mediation Wednesday.The union is demanding a 40% wage increase over three to four years and rejected the company's offer of a 25% raise.The International Association of Machinists and Aerospace Workers began a strike of the company following a vote last Thursday. Boeing (BA) and its largest union partner are resuming contract negotiations with federal mediators present Wednesday, the International Association ...