 Deutsche Bank analyst Michael Linenberg downgraded Mesa Air Group Inc NASDAQ:MESA to Hold from Buy and lowered the price target to 7 an upside of 20.7, from 15. Linenberg says the company faces higher than average cost pressures in two areas for at least the next two quarters: trainingstaffing due to increased turnover and elevated maintenance expense primarily due to more expensive spare part support driven by supply chain constraints. 