I stay at home and look after the children disadvantage of science and technology essay âA comeback in spare parts for planes bodes well for theseguys because itâs a really profitable business,â Christian Mayes, an analyst with Edward Jones & Co., said in a telephoneinterview. âDemand has been pent up for so long with airlinesholding back on restocking, but they just couldnât hold backanymore. It was really overdue for a bounce back.â