American Airlines, yesterday:

Set to break ground in 2027, the Gate D60 project charts the next chapter of travel at MIA, with a new concourse expansion designed for a premier airport. Currently equipped to support ground operations for smaller regional jets, the new three-level Concourse D extension will create 17 new aircraft gates to accommodate larger aircraft and eliminate outside boarding. The project will expand a single shared boarding area to include adjoining boarding spaces for every gate to improve flow and provide customers with more space and comfort.