Note: This is a sub-section of Short Brothers.
1938 the final three Empires of the initial order placed by Imperial Airways – 'Coorong', 'Coogee', and 'Corio' – were diverted from the Imperial Airways order and were delivered instead to Anglo-Australian Qantas Empire Airways.
In late 1937, due to Imperial Airways satisfaction with its operational experience with the aircraft of the initial batch, the company placed a follow-on order for another 11 Empire flying boats; combined with the original 28 order, this had the distinction of being the largest single order to have ever been placed for a British civil aircraft at that time.
While the first three aircraft of the additional order were of the typical S.23 class, the rest were manufactured to a differing design, designated as the S.30.
| Registration | Name | Operator |
| G-AFCT | Champion | Imperial Airways, later BOAC |
| G-AFCU | Cabot | Imperial Airways, to RAF in 1939 (as V3137) |
| G-AFCV | Caribou | Imperial Airways, to RAF in 1939 (as V3138) |
| G-AFCW | Connemara | Imperial Airways |
| G-AFCX | Clyde | Imperial Airways, later BOAC |
| G-AFCY | Captain Cook | Imperial Airways, to TEAL in 1940 (as ZK-AMC Awarua) |
| G-AFCZ | Australia then Clare | Imperial Airways, later BOAC |
| G-AFDA | Aotearoa | Imperial Airways, to TEAL in 1940 (as ZK-AMA) |
| G-AFKZ | Cathay | Imperial Airways, later BOAC |