...NEW YORK (S&P Global Ratings) Dec. 12, 2018--American Airlines Inc. is amending its three revolving credit facilities, including upsizing and adding collateral to its $1 billion revolving credit facility secured by routes, gates, and slots at London's Heathrow International Airport. The upsized Heathrow revolving credit facility would increase to $1.5425 billion. American is adding its routes, gates, and slots related to flying to other European airports to the collateral securing the revolving credit and related term loan that currently has $1.215 billion outstanding. We are affirming our '##+' issue-level ratings and maintaining our '1' recovery ratings, indicating an expected very high recovery (90%-100%; rounded estimate: 95%) in a hypothetical default scenario, on the revolving credit and term loan secured by the Heathrow and European collateral. Our other issue-level and recovery ratings are not affected. American proposes to amend its three revolving credit facilities, extending...