Now that QR is (i) flying A380 to SYD and (ii) there is Fx2 on the route, I must decide...
Option 1 (current itin) -- AA J, QF F, and QF F:
Sun, arrive LHR at 6:20 AM
--~14 hours--
Sun, depart LHR at 8:35 PM
Mon, arrive DXB at 7:35 AM
--~2 hours--
Mon, depart DXB at 9:35 AM
Tue, arrive SYD at 6:30 AM
Option 2 (QF short, QR long) -- AA J, QF F, QR F, QR F:
Sun, arrive LHR at 6:20 AM
-- ~14 hours --
Sun, depart LHR at 8:35 PM (QF F)
Mon, arrive DXB at 7:35 AM
Mon, depart DXB at ?? (QR F)
-- ~11 hours to spend between DXB and DOH --
Mon, arrive DOH at ??
Mon, depart DOH at 8:50 PM (QR F)
Tue, arrive SYD at 5:50 PM
Option 3 (QR short, QF long) -- AA J, QR F, QR F, QF F:
Sun, arrive LHR at 6:20 AM
--~3 hours (or 8 hours)--
Sun, depart LHR at 9:05 AM (or at 2:15 PM) (QR F)
Sun, arrive DOH at 6:50 PM (or at 11:59 PM)
-- 2 to 12 hours overnight in Al Safwa or Hotel --
Mon, depart DOH at 2:05 AM (or at 6:00 AM) (QR F)
Mon, arrive DXB at 4:10 AM (or 8:10 AM)
-- 1.5 to 5 hours in EK F Lounge--
Tue, depart DXB at 9:35 AM (QF F)
Arrive SYD at 6:30 AM