Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  |  |  | Year Ended December 31, | Year Ended December 31, |
| --- | --- | --- | --- | --- |
|  |  |  | 2019 | 2018 |
| (In millions) | Total operating expenses - GAAP |  | $42,703 | $41,885 |
| Operating net special items (1) : | (In millions) | Mainline operating special items, net | (635) | (787) |
| Operating net special items (1) : | (In millions) | Regional operating special items, net | (6) | (6) |
| Fuel: | (In millions) | Aircraft fuel and related taxes - mainline | (7,526) | (8,053) |
| Fuel: | (In millions) | Aircraft fuel and related taxes - regional | (1,869) | (1,843) |
| Fuel: | (In millions) | Total operating expenses, excluding net special items and fuel | $32,667 | $31,196 |
| (In millions) | Total Available Seat Miles (ASM) |  | 285,088 | 282,054 |
| (In cents) | Total operating CASM |  | 14.98 | 14.85 |
| Operating net special items per ASM (1) : | (In cents) | Mainline operating special items, net | (0.22) | (0.28) |
| Operating net special items per ASM (1) : | (In cents) | Regional operating special items, net | — | — |
| Fuel per ASM: | (In cents) | Aircraft fuel and related taxes - mainline | (2.64) | (2.86) |
| Fuel per ASM: | (In cents) | Aircraft fuel and related taxes - regional | (0.66) | (0.65) |
| Fuel per ASM: | (In cents) | Total CASM, excluding net special items and fuel | 11.46 | 11.06 |
Question:
What was American's regional cost of fuel per ASM in 2019?
Answer:
(0.66)