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:
| Type | Seats | Average Age (Yrs) | Number of Aircraft | Number Owned (a) | Number Leased |
| --- | --- | --- | --- | --- | --- |
| 737-700 | 143 | 15 | 512 | 396 | 116 |
| 737-800 | 175 | 3 | 207 | 200 | 7 |
| 737 MAX 8 | 175 | 1 | 31 | 31 | — |
| Totals |  | 11 | 750 | 627 | 123 |
Question:
What is the total aircraft numbers owned by SouthWest in 2018?
Answer:
627