reported that just 11 Americans underwent the procedure for a third time between 1995 and November 2018. Since then, there have been at least two more successful third-timers aside from Flores: 34-year-old Cassie Stanley last July and 37-year-old Tricia Lawrenson in April, both of whom have cystic fibrosis.The reasons that it’s so rare to receive a third double-lung transplant are myriad.