To specify airline and airport routing sequences
| Position | Element | Name | Type | Min/Max | Repeat | |
|---|---|---|---|---|---|---|
| 1 | 140 | Standard Carrier Alpha Code | Opt | ID | 2/4 | 1 |
| 2 | 140 | Standard Carrier Alpha Code | Opt | ID | 2/4 | 1 |
| 3 | 5 | Airport Code | Mandatory | ID | 3/5 | 1 |
| 4 | 4 | Air Carrier Code | Mandatory | ID | 3/3 | 1 |
| 5 | 5 | Airport Code | Mandatory | ID | 3/5 | 1 |
| 6 | 4 | Air Carrier Code | Rel | ID | 3/3 | 1 |
| 7 | 5 | Airport Code | Rel | ID | 3/5 | 1 |
| 8 | 4 | Air Carrier Code | Rel | ID | 3/3 | 1 |
| 9 | 5 | Airport Code | Rel | ID | 3/5 | 1 |
| 10 | 4 | Air Carrier Code | Rel | ID | 3/3 | 1 |
| 11 | 5 | Airport Code | Rel | ID | 3/5 | 1 |
| 12 | 4 | Air Carrier Code | Rel | ID | 3/3 | 1 |
| 13 | 5 | Airport Code | Rel | ID | 3/5 | 1 |