Boeing’s problems are rippling across major U.S. airlines. Airlines are cutting back on flying and tempering plans to hire pilots and flight attendants as they prepare to receive fewer Boeing planes than they had planned at the start of the year. Southwest Airlines said Tuesday that it would cut flight capacity and re-evaluate its financial guidance‚ citing lower-than-expected deliveries of Boeing jets. The carrier’s shares tumbled around 15% in afternoon trading‚ as the carrier also...