Key TakeawaysHoneywell's latest update on its ongoing portfolio review noted the company was considering spinning off its aerospace business.Honeywell explained that it was considering "transformational changes" in the firm.Activist investor Elliott Investment Management, which holds a more than $5 billion stake and has called for a shakeup of the company, said it welcomed the statement. Honeywell International (HON) shares advanced Monday as the conglomerate issued an update on its portfolio review begun ...