United Postal Service CEO Carol Tome said Tuesday that the company is officially retiring its fleet of McDonnell Douglas MD-11 cargo planes after one of them was involved in a deadly crash in Louisville.  Tome told analysts on its fourth-quarter earnings call that the shipping giant has taken a "systematic programmatic approach to modernizing" its global air fleet, which included "the decision to accelerate our plans and retire all MD-11 aircraft in our fleet." That was completed in the fourth quarter.Tome ...