 From Massport and developers who want in on the action there, the plans call for nearly two dozen additional brand new hangars to be installed as those with means take to more private jets. Critics of the plan say the use of private planes carries one of the biggest carbon footprints around and it's disingenuous for the Healy administration to support this kind of development when green energy goals are a centerpiece on Beacon Hill. Environmental officials say several issues need to be addressed, but