# IATA Resolution 600a Air Waybill (AWB) 11-Digit MOD-7 Spec
> Verify 11-digit IATA Air Waybill check digits and airline prefixes with deterministic MOD-7 arithmetic.

- **Canonical URL:** https://stanzaapi.com/tools/iata-validator/standard/air-waybill-awb-mod7
- **Governing Standard:** IATA Resolution 600a & Resolution 722e (International Air Transport Association (IATA))
- **Latency:** <1ms Edge
- **Privacy:** In-memory execution only (zero data stored or logged)

## Technical Overview & Governing Rules
An IATA Air Waybill consists of a 3-digit airline accounting prefix, a hyphen or space, a 7-digit serial number, and a 1-digit MOD-7 check digit.

## Specification Matrix
| Part | Digits | Example | Function |
| --- | --- | --- | --- |
| Airline Prefix | 3 digits | 016 | Identifies airline (016 = United) |
| Serial Number | 7 digits | 1234567 | Unique cargo consignment sequence |
| Check Digit | 1 digit | 5 | Serial % 7 (1234567 % 7 = 5) |

## Standard JSON Response Model
```json
{
  "awb": "016-12345675",
  "airline": "United Airlines",
  "checkDigitValid": true
}
```

## Frequently Asked Questions & Edge Cases
### Q: What happens if a serial % 7 is 0?
**A:** The check digit is 0. Valid check digits are always in the range 0 through 6.