NOTES TO CONSOLIDATED FINANCIAL STATEMENTS OF AMERICAN AIRLINES GROUP INC. (a) 2013, 2014, April 2016 and December 2016 Credit Facilities 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities 100 In December 2018, American and AAG entered into a Fourth Amendment (the Fourth Amendment to the April 2016 Credit Agreement) to the Credit and Guaranty Agreement, amending the Credit and Guaranty Agreement dated as of April 29, 2016 (as previously amended, the April 2016 Credit Agreement, and the revolving credit facility established thereunder, the April 2016 Revolving Facility, the term loan facility established thereunder, the 2016 Term Loan Facility and the 2016 April Revolving Facility together with the 2016 Term Loan Facility, the April 2016 Credit Facilities). Pursuant to the Fourth Amendment to the April 2016 Credit Agreement, adjustments to the April 2016 Revolving Facility were made, including extending the maturity date from October 2022 to October 2023 for the revolver loans established thereunder and reducing the LIBOR margin from 2.25% to 2.00% and the base rate margin from 1.25% to 1.00% for certain of the lenders of the revolver loans thereunder. As of December 31, 2018, there were no borrowings or letters of credit outstanding under the April 2016 Revolving Facility. In December 2018, American and AAG entered into a Sixth Amendment (the Sixth Amendment to the 2014 Credit Agreement) to the 2014 Credit Agreement, as previously amended by the Fifth Amendment to the 2014 Credit Agreement. Pursuant to the Sixth Amendment to the 2014 Credit Agreement, adjustments to the 2014 Revolving Facility were made, including increasing the total aggregate commitments under the 2014 Revolving Facility by approximately $543 million, extending the maturity date for the revolver loans thereunder from October 2022 to October 2023 and reducing the LIBOR margin from 2.25% to 2.00% and the base rate margin from 1.25% to 1.00% for certain of the lenders of the revolver loans thereunder. In addition to the slots, gates and routes (SGR) between airports in the United States and LHR previously pledged as collateral for the 2014 Credit Facilities, SGR between airports in the United States and other countries in the European Union were added as collateral under the 2014 Credit Facilities pursuant to the Sixth Amendment to the 2014 Credit Agreement. As of December 31, 2018, there were no borrowings or letters of credit outstanding under the 2014 Revolving Facility. In September 2018, American and AAG entered into a Fifth Amendment (the Fifth Amendment to the 2014 Credit Agreement) to the Amended and Restated Credit and Guaranty Agreement, amending the Amended and Restated Credit and Guaranty Agreement dated as of April 20, 2015, which amended and restated the Credit and Guaranty Agreement dated as of October 10, 2014 (as previously amended, the 2014 Credit Agreement, the revolving credit facility established thereunder, the 2014 Revolving Facility, the term loan facility established thereunder, the 2014 Term Loan Facility, and the 2014 Revolving Facility together with the 2014 Term Loan Facility, the 2014 Credit Facilities). The Fifth Amendment to the 2014 Credit Agreement provides for incremental term loans in the amount of $500 million under the 2014 Term Loan Facility. The terms of such incremental term loans are substantially similar to the terms of the existing term loans under the 2014 Term Loan Facility, including those with regard to maturity and interest rate margins. As of December 31, 2018, approximately $1.2 billion was outstanding under the 2014 Term Loan Facility. In December 2018, American and AAG entered into a Fifth Amendment (the Fifth Amendment to the 2013 Credit Agreement) to the 2013 Credit Agreement, as previously amended by the Fourth Amendment to the 2013 Credit Agreement. Pursuant to the Fifth Amendment to the 2013 Credit Agreement, adjustments to the 2013 Revolving Facility were made, including reducing the total aggregate commitments under the 2013 Revolving Facility by $200 million, extending the maturity date for the revolver loans thereunder from October 2022 to October 2023 and reducing the LIBOR margin from 2.25% to 2.00% and the base rate margin from 1.25% to 1.00% for certain of the lenders of the revolver loans thereunder. As of December 31, 2018, there were no borrowings or letters of credit outstanding under the 2013 Revolving Facility. In May 2018, American and AAG entered into a Fourth Amendment (the Fourth Amendment to the 2013 Credit Agreement) to the Amended and Restated Credit and Guaranty Agreement, amending the Amended and Restated Credit and Guaranty Agreement dated as of May 21, 2015, which amended and restated the Credit and Guaranty Agreement dated as of June 27, 2013 (as previously amended, the 2013 Credit Agreement, the revolving facility established thereunder, the 2013 Revolving Facility, the term loan facility established thereunder, the 2013 Term Loan Facility, and the 2013 Revolving Facility together with the 2013 Term Loan Facility, the 2013 Credit Facilities), pursuant to which American refinanced $1.8 billion of the existing term loans outstanding under the 2013 Credit Facilities with proceeds of term loans incurred under the Fourth Amendment to the 2013 Credit Agreement (the 2013 Replacement Term Loans). The LIBOR margin on the 2013 Replacement Term Loans was reduced from 2.00% to 1.75% and the base rate margin on the 2013 Replacement Term Loans was reduced from 1.00% to 0.75%. Additionally, the maturity date of the 2013 Replacement Term Loans was extended to June 2025 pursuant to the Fourth Amendment to the 2013 Credit Agreement.