Originally Posted by
DCAstudent
It now makes clear that three class MIA/BOS-LAX have access.
Yep
Los Angeles (LAX) and Miami (MIA) for customers on flights operated by a 3-class Boeing 777-300 aircraft only (from May 3, 2019 - October 26, 2019)
Los Angeles (LAX) and Boston (BOS) for customers on flights operated by a 3-class Airbus 321T aircraft only (from April 2, 2019)