U.S. airlines prepare for 737 MAX tests, Southwest parks jets near desert

Teams from the three U.S. airlines that own 737 MAX jets were heading to Boeing Co's factory in Renton, Washington, to review a software upgrade on Saturday, even as Southwest Airlines Co began parking its 34 MAXs near the California desert.The factory visits indicate Boeing may be nearing completion of a planned software patch for its newest 737 following a fatal Lion Air crash in Indonesia last October, but the timing for a resumption of passenger flights on the jets remains uncertain.Boeing a