Originally Posted by
blutek
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Upper deck economy mini cabin is a good economic alternative. For four together see 35 & 36JK (avoid 36D).
Generally you will find 36D unallocated, unless the flight is full
I believe Qantas have a policy that 36D and 36E are to be the last seats in the cabin allocated; although I have seen rare exceptions. This means allocating 36F is often means a row of three to onself.