The struggling aircraft manufacturer Boeing announced on Sunday that it has reached a tentative agreement with its largest union which includes a 25% wage increase just days before a threatened strike. The International Association of Machinists (IAM), which represents approximately 33,000 employees, had originally been advocating for raises of about 40%. The income increase agreed on Sunday, as well as improvements to healthcare costs and retirement benefits, are to be applied over four years. It also provides increased job security for union members, including a commitment to build the next …