The grounding of Boeing Co.'s 737 Max jet will have ripple effects – not all of them bad – across an aviation industry that's been a steadying force for industrial conglomerates. The U.S. Federal Aviation Administration on March 13 followed virtually every other relevant regulator in issuing a precautionary ban of the Max after a combined 346 people died in two fatal crashes over the past five months. On the one hand, with the Boeing best-seller out of commission, carriers such as Southwest Airlines Co. and American Airlines Group Inc. may be forced to turn to older aircraft to maintain capacity, notes Bloomberg Intelligence analyst Douglas Rothacker. Older planes are more apt than newer ones to require maintenance and repair work, which is the biggest profit driver for most suppliers.