table of contents notes to consolidated financial statements of american airlines group inc . secured financings are collateralized by assets , primarily aircraft , engines , simulators , rotable aircraft parts , airport leasehold rights , route authorities and airport slots . at december 31 , 2015 , the company was operating 35 aircraft under capital leases . leases can generally be renewed at rates based on fair market value at the end of the lease term for a number of additional years . at december 31 , 2015 , the maturities of long-term debt and capital lease obligations are as follows ( in millions ) : .
what is the percent of the lease expenses after 2021 as a part of the total amount
( a ) 2013 credit facilities on june 27 , 2013 , american and aag entered into a credit and guaranty agreement ( as amended , restated , amended and restated or otherwise modified , the 2013 credit agreement ) with deutsche bank ag new york branch , as administrative agent , and certain lenders that originally provided for a $ 1.9 billion term loan facility scheduled to mature on june 27 , 2019 ( the 2013 term loan facility ) and a $ 1.0 billion revolving credit facility scheduled to mature on june 27 , 2018 ( the 2013 revolving facility ) . the maturity of the term loan facility was subsequently extended to june 2020 and the revolving credit facility commitments were subsequently increased to $ 1.4 billion with an extended maturity date of october 10 , 2020 , all of which is further described below . on may 21 , 2015 , american amended and restated the 2013 credit agreement pursuant to which it refinanced the 2013 term loan facility ( the $ 1.9 billion 2015 term loan facility and , together with the 2013 revolving facility , the 2013 credit facilities ) to extend the maturity date to june 2020 and reduce the libor margin from 3.00% ( 3.00 % ) to 2.75% ( 2.75 % ) . in addition , american entered into certain amendments to reflect the ability for american to make future modifications to the collateral pledged , subject to certain restrictions . the $ 1.9 billion 2015 term loan facility is repayable in annual installments , with the first installment in an amount equal to 1.25% ( 1.25 % ) of the principal amount commencing on june 27 , 2016 and installments thereafter , in an amount equal to 1.0% ( 1.0 % ) of the principal amount , with any unpaid balance due on the maturity date . as of december 31 , 2015 , $ 1.9 billion of principal was outstanding under the $ 1.9 billion 2015 term loan facility . voluntary prepayments may be made by american at any time . on october 10 , 2014 , american and aag amended the 2013 credit agreement to extend the maturity date of the 2013 revolving facility to october 10 , 2019 and increased the commitments thereunder to an aggregate principal amount of $ 1.4 billion while reducing the letter of credit commitments thereunder to $ 300 million . on october 26 , 2015 , american , aag , us airways group and us airways amended the 2013 credit agreement to extend the maturity date of the 2013 revolving facility to october 10 , 2020 . the 2013 revolving facility provides that american may from time to time borrow , repay and reborrow loans thereunder and have letters of credit issued thereunder . as of december 31 , 2015 , there were no borrowings or letters of credit outstanding under the 2013 revolving facility . the 2013 credit facilities bear interest at an index rate plus an applicable index margin or , at american 2019s option , libor ( subject to a floor of 0.75% ( 0.75 % ) , with respect to the $ 1.9 billion 2015 term loan facility ) plus a libor margin of 3.00% ( 3.00 % ) with respect to the 2013 revolving facility and 2.75% ( 2.75 % ) with respect to the $ 1.9 billion 2015 term loan facility ; provided that american 2019s corporate credit rating is ba3 or higher from moody 2019s and bb- or higher from s&p , the applicable libor margin would be 2.50% ( 2.50 % ) for the $ 1.9 billion 2015 term loan .