Well, AI out of SYD is non-existent. No tricks I tried would work ( including married segments etc.).
You could chose TG, since F class is available out of SYD on March 6th, or try calling in to explain your situation (um, why you must fly Air India !).
Availability for 1 person is as follows:
[KVS Tool 8.7.7/Diamond - Awards/AC-StarAlliance/CA-Auto]
Code:
SYD Sydney Kingsford Smith NS AU [YSSY]
DEL Delhi Indira Gandhi Intl IN [VIDP]
TUE 06 Mar 2018 1 Seat
Carrier Flight From Depart To Arrive A/C St Award Availability
--------- ------ ---- -------- ---- -------- --- -- ------------------
AI 301 SYD 10:45 DEL 17:50 788 0 CS+ YS+
TG 476 SYD 10:00 BKK 15:25 747 0 FS+ YS+
-> TG 315 BKK 20:00 DEL 23:00 773 0 CS+ YS+
TG 476 SYD 10:00 BKK 15:25 747 0 FS+ YS+
-> AI 333 BKK 08:50 +1 DEL 12:05 +1 788 0 CS+ YS+
TG 476 SYD 10:00 BKK 15:25 747 0 FS+ YS+
-> TG 331 BKK 23:25 DEL 02:20 +1 787 0 YS+
TG 476 SYD 10:00 BKK 15:25 747 0 YS+
-> AI 335 BKK 21:05 DEL 00:25 +1 32B 0 YS+
TG 476 SYD 10:00 BKK 15:25 747 0 YS+
-> AI 331 BKK 20:30 BOM 23:15 788 0 YS+
-> AI 864 BOM 07:00 +1 DEL 09:05 +1 32B 0 YS+
TG 476 SYD 10:00 BKK 15:25 747 0 YS+
-> TG 329 BKK 22:10 HYD 00:25 +1 777 0 YS+
-> AI 559 HYD 06:40 +1 DEL 08:50 +1 321 0 YS+
TG 476 SYD 10:00 BKK 15:25 747 0 YS+
-> TG 337 BKK 22:25 MAA 00:30 +1 777 0 YS+
-> AI 440 MAA 06:10 +1 DEL 08:55 +1 321 0 YS+
TG 476 SYD 10:00 BKK 15:25 747 0 YS+
-> SQ 983 BKK 20:00 SIN 23:30 333 0 CS+
-> SQ 402 SIN 02:35 +1 DEL 05:55 +1 772 0 CS+