Speaking at this week's CAPA 2015 Australia Pacific Aviation Summit in Sydney, Joyce confirmed that the A350 was recently weighed up against the Boeing 787, with Qantas running the numbers on both of the next-gen jetliners.
"We looked at both types of aircraft, on what the relative positions of the A350 and Boeing 787 were, and we found on all accounts the 787-9 was the better aircraft for us, for the market that we're talking about and the network that we're talking about" Joyce said.
Joyce added that Qantas was now in the stage of "working through the route economics and the network economics" of the Boeing 787.
A series of delays pushed the Dreamliner's debut back to October 2011, with Jetstar seeing its first Boeing 787-8 in October 20-13.
Qantas also trimmed its order to a combination of 20 jets with guaranteed delivery from late 2017, with a further 30 'purchase rights' lacking a fixed hand-over timeframe.
However, Joyce moved to dampen speculation that the airline would announce a Boeing 787 purchase at its financial results briefing later this month, when Qantas is expected to reveal a full year profit around the $900 million mark.
"The pilots' agreement was good step in the right direction to allow us to justify the business case for the 787, but we're still not there yet. The pilots agreement is one part of getting that business case to work (but) there are some more pieces of work that we have to complete."
That includes bolstering Qantas' balance sheet and "paying down a billion dollars in debt," Joyce said.
"We're now working through the route economics and network economics, and working out how we can justify the acquisition of the 787s – and if we can, we have plenty of aircraft options for 2017 onwards, so we're working through that process now."
Qantas needs to make its call on the first five of its Boeing 787-9 orders before the end of this year in order to lock in delivery for late 2017.
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