This week, Madhu Unnikrishnan and Edward "Ned" Russell, the team behind Airline Weekly, look at why so many Latin American carriers are buying aircraft and if the OEMs are right that airlines are just starting a massive fleet-replacement cycle. It's early days, but the U.S. Senate passed a massive infrastructure spending bill, so will that mean NextGen could finally get off the ground? And why is Mesa Air struggling with maintenance?   Stay ahead of aviation news with a subscription to Airline Weekly.