On Thursday's "Mad Money" show, Jim Cramer predicted an impending bull market in aerospace and encouraged viewers to get into the sector.Boeing ( BA) is rated buy by only three analysts, which Cramer said provides an opportunity for upgrades. Also, the company's 787 plane will be flying soon. On Friday, Boeing closed up $2.08, or 4.1%, at $52.65. Boeing's suppliers will also benefit, he said, including Allegheny Technologies ( ATI), Alcoa ( AA), Precision Castparts ( PCP), United Technologies ( UTX) and BEA Aerospace ( BEAV). On Friday, Allegheny added 55 cents, or 1.4%, to $40.91; Alcoa added 25 cents, or 2.3%, to $10.94; Precision Castparts closed up $2.38, or 2.8%, at $87.68; United Technologies gained $1.26, or 2.3%, to $56.39; and BEA Aerospace closed up 57 cents, or 3.5%, at $16.81. Cramer put Wind River Systems ( WIND) on the Sell Block on Thursday because of Intel's ( INTC) takeover bid for the company. He'd recommended Wind River about a year and a half ago as a possible takeover play, and the stock is up 35% since then. On Friday, Wind River lost 13 cents, or 1.1%, to close at $11.63.