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:
| (in millions, except repurchase price) | Share Repurchase Authorization | Average Repurchase Price | Planned Completion Date | Authorization Remaining |
| --- | --- | --- | --- | --- |
| May 2014 Program | $2,000 | $42.86 | December 31, 2016 | Completed June 2015 |
| May 2015 Program | $5,000 | $45.32 | December 31, 2017 | Completed September 2017 |
| May 2017 Program | $5,000 | $52.13 | December 31, 2020 | $4,675 |
Question:
what was the average repurchase price for Delta Airline shares in 31st December, 2017?
Answer:
$45.32