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v3.21.1

Finance income and cost | 12 Months Ended
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Dec. 31, 2020
Finance income and cost |
Finance income and cost | 21. Finance income and cost An analysis of finance income is as follows:
|  | 2020 |  | 2019 |  | 2018
Interest on cash and equivalents |  | Ps. | 93,122 |  | Ps. | 201,191 |  | Ps. | 152,437
Interest on asset backed trust notes |  |  | 6,342 |  |  | 6,525 |  |  | —
Interest on recovery of guarantee deposits |  |  | 2,047 |  |  | 83 |  |  | 166
|  | Ps. | 101,511 |  | Ps. | 207,799 |  | Ps. | 152,603
An analysis of finance cost is as follows:
|  | 2020 |  | 2019 |  | 2018
Interest expense on lease liabilities and aircraft and engine lease return obligation |  | Ps. | 2,350,250 |  | Ps. | 2,128,162 |  | Ps. | 1,755,978
Financial instruments loss |  |  | 448,559 |  |  | — |  |  | —
Interest on asset backed trust notes |  |  | 116,240 |  |  | 80,314 |  |  | —
Cost of letter credit notes |  |  | 73,141 |  |  | 49,856 |  |  | 57,277
Bank fees and others |  |  | 3,707 |  |  | 3,607 |  |  | 6,141
Interest on debts and borrowings* |  |  | 16,368 |  |  | 1,660 |  |  | 56,916
Other finance costs |  |  | 10,219 |  |  | 6,230 |  |  | —
|  | Ps. | 3,018,484 |  | Ps. | 2,269,829 |  | Ps. | 1,876,312
* The borrowing costs related to the acquisition or construction of qualifying assets are capitalized as part of the cost of the asset (Note 12). Interest expense not capitalized is related to the short-term working capital facility from Citibanamex.
|  | 2020 |  | 2019 |  | 2018
Interest on debts and borrowings |  | Ps. | 400,406 |  | Ps. | 457,973 |  | Ps. | 414,836
Capitalized interest (Note 12) |  |  | (384,038) |  |  | (456,313) |  |  | (357,920)
Net interest on debts and borrowing in the consolidated statements of operations |  | Ps. | 16,368 |  | Ps. | 1,660 |  | Ps. | 56,916

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- Definition The disclosure of interest income and expense. [Refer: Interest income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_10_e&doctype=Standard -URIDate 2020-01-01 + Details
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