The daughter of Galileo conjured up a spellbinding performance in the Fillies and Mares on Champions Day and will bid for a second Group 1 on the bounce.
However, if she's to land the top level prize she'll need to turn the tables on Enable, who left her stranded in the Arc at the beginning of the month.
O'Brien, who is under no illusions as to the task that his challenger will be faced with, said on Thursday: "We are thinking she might go to the Turf with Hunting Horn.
"She is in good form since Ascot. She showed at Ascot she gets a mile and a half, but she has not done much since.
"Wayne Lordan rode her in the Arc and he was delighted with her, because that was her first time over a mile and a half.
"She is a filly that has had an easy enough season, because she has had a few little setbacks.
"We were training her for the Oaks, but she had a setback and missed it. It might be a blessing in disguise she is going into the autumn as a fresh filly."
I Can Fly was a revelation in the Queen Elizabeth II Stakes last week, finding Roaring Lion just too strong in a thrilling finish.
That performance booked her ticket for the plane over to Churchill Downs, where she'll take on the best in the Breeders' Cup Mile.
O'Brien said: "She seems to be comfortable back at a mile, and good ground and soft ground all comes easy to her.
"Donnacha (O'Brien) was delighted with her the last day."
Gustav Klimt has popped his head up at every big racing festival this year and will join his stablemate in the same race. The three-year-old has been slightly disappointing for most of the season but got back on track with a decent run in the Foret last time out.
"Ryan (Moore) rode him the last day at Longchamp (fourth in the Foret) and he was delighted with him," said the trainer.
"He felt really well, and we were thinking of going back and giving him another chance at a mile.
"We were only just beaten in the Haydock Sprint Cup the time before last. He is a lovely, balanced horse that travels and quickens well.
"We would love to see what he would do over the mile and we think he would love racing around a bend. Ryan was very happy with him in the Foret – which is really a good sign."
VERTEM FUTURITY Eleven declared for Saturday's Group 1 as Aidan O'Brien leaves in three
So Perfect is another filly likely to form part of a formidable team for the Irish champion trainer.
"We are just discussing which way we want to go with her," O'Brien said.
"She is a fast filly as well. It is whether we give her a chance in the mile and find out about her for next year – or to go for the sprint. The lads have not decided what they want to do with her.
"She is a big, powerful, fast filly."
Anthony Van Dyck had been O'Brien's big hope for the Dewhurst, but although he ran well he was no match for Too Darn Hot or Advertise.
That seven furlong trip was likely too sharp side for the well-bred colt, though, and the step up to a mile in the Juvenile Turf should be ideal.
"At the moment we are looking more at Anthony Van Dyck than Broome running, without having definitely decided," said O'Brien.
"Broome is in good form and he has had a tough enough season. He has travelled a good bit, but he is a solid enough horse .
"He is the sort of horse we are taking it day by day with. He seems to be in good form."
O'Brien's long wait for the Classic could be over when he fields top class dirt performer Mendelssohn. His third in the Jockey Club Gold Cup last time out was a brilliant performance considering he set a furious pace the whole way, and this has been the plan ever since.
The trainer said: "He has started his prep, we have been happy with his three runs up to it and we've been happy with him since.
"We think he has progressed with every run since. Ryan was very happy with him on the last day."
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