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:
|  | Current Fleet (1) | Current Fleet (1) | Current Fleet (1) | Current Fleet (1) |  | Commitments | Commitments |
| --- | --- | --- | --- | --- | --- | --- | --- |
|  | Owned | Finance Lease | Operating Lease | Total | Average Age | Purchase | Options |
| B-717-200 | 3 | 16 | 72 | 91 | 17.3 | — | — |
| B-737-700 | 10 | — | — | 10 | 9.9 | — | — |
| B-737-800 | 73 | 4 | — | 77 | 17.3 | — | — |
| B-737-900ER | 73 | — | 39 | 112 | 2.7 | 18 | — |
| B-757-200 | 89 | 9 | 2 | 100 | 21.4 | — | — |
| B-757-300 | 16 | — | — | 16 | 15.9 | — | — |
| B-767-300 | 2 | — | — | 2 | 25.5 | — | — |
| B-767-300ER | 55 | 1 | — | 56 | 22.6 | — | — |
| B-767-400ER | 21 | — | — | 21 | 18.0 | — | — |
| B-777-200ER | 8 | — | — | 8 | 19.1 | — | — |
| B-777-200LR | 10 | — | — | 10 | 9.8 | — | — |
| A220-100 | 4 | — | — | 4 | 0.1 | 36 | 50 |
| A220-300 | — | — | — | — | — | 50 | — |
| A319-100 | 55 | — | 2 | 57 | 16.8 | — | — |
| A320-200 | 55 | 3 | 4 | 62 | 23.4 | — | — |
| A321-200 | 37 | — | 28 | 65 | 1.2 | 62 | — |
| A321-200neo | — | — | — | — | — | 100 | 100 |
| A330-200 | 11 | — | — | 11 | 13.8 | — | — |
| A330-300 | 28 | — | 3 | 31 | 9.9 | — | — |
| A330-900neo | — | — | — | — | — | 35 | — |
| A350-900 | 11 | — | — | 11 | 1.0 | 14 | — |
| MD-88 | 71 | 13 | — | 84 | 28.1 | — | — |
| MD-90 | 43 | — | — | 43 | 21.8 | — | — |
| Total | 675 | 46 | 150 | 871 | 16.0 | 315 | 150 |
Question:
How many A321-200 neo aircraft did Delta airlines commit to purchase as of the end of 2018? 
Answer:
100