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Debt (Tables) | 6 Months Ended
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Jun. 30, 2017
Details of Pass Through Trusts | Certain details of the pass-through trusts with proceeds received from issuance of debt in 2017 are as follows (in millions, except stated interest rate):
EETC Date |  | Class |  | Principal |  |  | Final expected distribution date |  | Stated interest rate |  |  | Total debt recorded as of June 30, 2017 |  |  | Proceeds received from issuance of debt during 2017 |  |  | Remaining proceeds from issuance of debt to be received in future periods |
September 2016 |  | AA |  | $ | 637 |  |  | October 2028 |  |  | 2.875% |  |  | $ | 445 |  |  | $ | 364 |  |  | $ | 192 |
September 2016 |  | A |  |  | 283 |  |  | October 2028 |  |  | 3.10% |  |  |  | 197 |  |  |  | 162 |  |  |  | 86 |
June 2016 |  | AA |  |  | 729 |  |  | July 2028 |  |  | 3.10% |  |  |  | 729 |  |  |  | 319 |  |  |  | — |
June 2016 |  | A |  |  | 324 |  |  | July 2028 |  |  | 3.45% |  |  |  | 324 |  |  |  | 142 |  |  |  | — |
|  |  |  | $ | 1,973 |  |  |  |  |  |  |  |  | $ | 1,695 |  |  | $ | 987 |  |  | $ | 278 |
Contractual Principal Payments | The table below presents the Company’s contractual principal payments (not including debt discount or debt issuance costs) at June 30, 2017 under then-outstanding long-term debt agreements (in millions):
Last six months of 2017 |  | $ | 333 |
2018 |  |  | 1,495 |
2019 |  |  | 1,082 |
2020 |  |  | 1,086 |
2021 |  |  | 1,071 |
After 2021 |  |  | 7,199 |
|  | $ | 12,266 |

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- Definition Schedule of Debt Instruments Pass Through Trusts + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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