When you make a booking for a member company on a British Airways eligible flight, you will need to enter the On Business membership number following the instructions below.
The On Business membership number must be entered in an OSI field using one of the following entries:
| Abacus entry | 3OSI BA BTOB./123456XX |
| Amadeus entry | SK BTOB BA-/123456XX |
| Galileo entry | SI.BA*BTOB./123456XX |
| Sabre entry | 3OSI BA BTOB./123456XX |
| Worldspan entry | 3OSI BA BTOB./123456XX |
Replace 123456XX with the customer's On Business membership number.
Leave spaces between letters where shown.
If a traveller is a member of the British Airways Executive Club, please continue to include their membership details in bookings.