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:
| Employee Group | Approximate Number of Active Employees Represented | Union | Date on which Collective Bargaining Agreement Becomes Amendable |
| --- | --- | --- | --- |
| Delta Pilots | 13,203 | ALPA | December 31, 2019 |
| Delta Flight Superintendents (Dispatchers) (1) | 432 | PAFCA | March 31, 2018 |
| Endeavor Air Pilots | 1,976 | ALPA | January 1, 2024 |
| Endeavor Air Flight Attendants (1) | 1,307 | AFA | December 31, 2018 |
| Endeavor Air Dispatchers (1) | 60 | PAFCA | December 31, 2018 |
Question:
For Delta airlines, what was the approximate number of active Delta Pilots represented by ALPA in 2018?
Answer:
13,203