Key TakeawaysBoeing's shares are rising in premarket trading Tuesday, after a union voted to approve a third contract agreement—ending a strike at the plane maker that has lasted nearly two months.Members of the International Association of Machinists accepted an offer that included 38% pay increases, along with a ratification bonus that workers can elect to use as part of their retirement savings. Boeing’s latest proposal received the support of 59% of the votes cast by union members. Boeing's (BA) shares ...